11281831 has 4 divisors (see below), whose sum is σ = 12307464. Its totient is φ = 10256200.

The previous prime is 11281819. The next prime is 11281843. The reversal of 11281831 is 13818211.

11281831 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13818211 = 11 ⋅1256201.

It is an interprime number because it is at equal distance from previous prime (11281819) and next prime (11281843).

It is a cyclic number.

It is not a de Polignac number, because 11281831 - 2⁷ = 11281703 is a prime.

It is a super-2 number, since 2×11281831² = 254559421425122, which contains 22 as substring.

It is a Duffinian number.

It is a nialpdrome in base 15.

It is a junction number, because it is equal to n+sod(n) for n = 11281796 and 11281805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11281811) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 512800 + ... + 512821.

It is an arithmetic number, because the mean of its divisors is an integer number (3076866).

Almost surely, 2^11281831 is an apocalyptic number.

11281831 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

11281831 is a deficient number, since it is larger than the sum of its proper divisors (1025633).

11281831 is a wasteful number, since it uses less digits than its factorization.

11281831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1025632.

The product of its digits is 384, while the sum is 25.

The square root of 11281831 is about 3358.8436998467. The cubic root of 11281831 is about 224.2813680965.

The spelling of 11281831 in words is "eleven million, two hundred eighty-one thousand, eight hundred thirty-one".