2151582631 has 4 divisors (see below), whose sum is σ = 2347181064. Its totient is φ = 1955984200.

The previous prime is 2151582619. The next prime is 2151582649. The reversal of 2151582631 is 1362851512.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2151582631 - 2⁹ = 2151582119 is a prime.

It is a super-2 number, since 2×2151582631² = 9258615636041764322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2151582691) 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, 97799200 + ... + 97799221.

It is an arithmetic number, because the mean of its divisors is an integer number (586795266).

Almost surely, 2^2151582631 is an apocalyptic number.

2151582631 is a deficient number, since it is larger than the sum of its proper divisors (195598433).

2151582631 is a wasteful number, since it uses less digits than its factorization.

2151582631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 195598432.

The product of its digits is 14400, while the sum is 34.

The square root of 2151582631 is about 46385.1552870097. The cubic root of 2151582631 is about 1290.9794918506.

The spelling of 2151582631 in words is "two billion, one hundred fifty-one million, five hundred eighty-two thousand, six hundred thirty-one".