2531620161 has 48 divisors (see below), whose sum is σ = 4431682944. Its totient is φ = 1359493632.

The previous prime is 2531620151. The next prime is 2531620181. The reversal of 2531620161 is 1610261352.

2531620161 is a `hidden beast` number, since 2 + 5 + 31 + 620 + 1 + 6 + 1 = 666.

2531620161 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 2531620161 - 2⁵ = 2531620129 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2531620151) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 944355 + ... + 947031.

It is an arithmetic number, because the mean of its divisors is an integer number (92326728).

Almost surely, 2^2531620161 is an apocalyptic number.

2531620161 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2531620161 is a deficient number, since it is larger than the sum of its proper divisors (1900062783).

2531620161 is a wasteful number, since it uses less digits than its factorization.

2531620161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3590 (or 3587 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 2531620161 is about 50315.2080488593. The cubic root of 2531620161 is about 1362.9068736997.

The spelling of 2531620161 in words is "two billion, five hundred thirty-one million, six hundred twenty thousand, one hundred sixty-one".