2151531 has 12 divisors (see below), whose sum is σ = 3159520. Its totient is φ = 1410480.

The previous prime is 2151521. The next prime is 2151533. The reversal of 2151531 is 1351512.

It is not a de Polignac number, because 2151531 - 2⁶ = 2151467 is a prime.

It is a super-2 number, since 2×2151531² = 9258171287922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2151533) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1411 + ... + 2508.

2^2151531 is an apocalyptic number.

2151531 is a deficient number, since it is larger than the sum of its proper divisors (1007989).

2151531 is a wasteful number, since it uses less digits than its factorization.

2151531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3986 (or 3983 counting only the distinct ones).

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

The square root of 2151531 is about 1466.8098036215. The cubic root of 2151531 is about 129.0969165329.

The spelling of 2151531 in words is "two million, one hundred fifty-one thousand, five hundred thirty-one".