2115531 has 32 divisors (see below), whose sum is σ = 3628800. Its totient is φ = 1203840.

The previous prime is 2115527. The next prime is 2115539. The reversal of 2115531 is 1355112.

It is not a de Polignac number, because 2115531 - 2² = 2115527 is a prime.

It is a super-2 number, since 2×2115531² = 8950942823922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2115539) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4840 + ... + 5258.

It is an arithmetic number, because the mean of its divisors is an integer number (113400).

2^2115531 is an apocalyptic number.

2115531 is a deficient number, since it is larger than the sum of its proper divisors (1513269).

2115531 is a wasteful number, since it uses less digits than its factorization.

2115531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 456 (or 450 counting only the distinct ones).

The product of its digits is 150, while the sum is 18.

The square root of 2115531 is about 1454.4865073283. The cubic root of 2115531 is about 128.3728346758.

The spelling of 2115531 in words is "two million, one hundred fifteen thousand, five hundred thirty-one".