11313131 has 4 divisors (see below), whose sum is σ = 11336664. Its totient is φ = 11289600.

The previous prime is 11313097. The next prime is 11313139. The reversal of 11313131 is 13131311.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13131311 = 307 ⋅42773.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11313131 is a prime.

It is a super-2 number, since 2×11313131² = 255973866046322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11313139) 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, 11030 + ... + 12011.

It is an arithmetic number, because the mean of its divisors is an integer number (2834166).

Almost surely, 2^11313131 is an apocalyptic number.

11313131 is a deficient number, since it is larger than the sum of its proper divisors (23533).

11313131 is an equidigital number, since it uses as much as digits as its factorization.

11313131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23532.

The product of its digits is 27, while the sum is 14.

The square root of 11313131 is about 3363.4998141817. The cubic root of 11313131 is about 224.4885899198.

Adding to 11313131 its reverse (13131311), we get a palindrome (24444442).

The spelling of 11313131 in words is "eleven million, three hundred thirteen thousand, one hundred thirty-one".