11315531 has 4 divisors (see below), whose sum is σ = 11328864. Its totient is φ = 11302200.

The previous prime is 11315519. The next prime is 11315533. The reversal of 11315531 is 13551311.

11315531 is digitally balanced in base 2, because in such base 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: 13551311 = 1091 ⋅12421.

It is a cyclic number.

It is not a de Polignac number, because 11315531 - 2¹⁰ = 11314507 is a prime.

It is a super-2 number, since 2×11315531² = 256082483623922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11315533) 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, 5300 + ... + 7121.

It is an arithmetic number, because the mean of its divisors is an integer number (2832216).

Almost surely, 2^11315531 is an apocalyptic number.

11315531 is a deficient number, since it is larger than the sum of its proper divisors (13333).

11315531 is an equidigital number, since it uses as much as digits as its factorization.

11315531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13332.

The product of its digits is 225, while the sum is 20.

The square root of 11315531 is about 3363.8565665022. The cubic root of 11315531 is about 224.5044633481.

Adding to 11315531 its reverse (13551311), we get a palindrome (24866842).

The spelling of 11315531 in words is "eleven million, three hundred fifteen thousand, five hundred thirty-one".