45156131021 has 4 divisors (see below), whose sum is σ = 45156556032. Its totient is φ = 45155706012.

The previous prime is 45156130973. The next prime is 45156131029. The reversal of 45156131021 is 12013165154.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 12013165154 = 2 ⋅6006582577.

It is a cyclic number.

It is not a de Polignac number, because 45156131021 - 2¹⁴ = 45156114637 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (45156131029) 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, 104006 + ... + 318008.

It is an arithmetic number, because the mean of its divisors is an integer number (11289139008).

Almost surely, 2^45156131021 is an apocalyptic number.

It is an amenable number.

45156131021 is a deficient number, since it is larger than the sum of its proper divisors (425011).

45156131021 is a wasteful number, since it uses less digits than its factorization.

45156131021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 425010.

The product of its (nonzero) digits is 3600, while the sum is 29.

Adding to 45156131021 its reverse (12013165154), we get a palindrome (57169296175).

The spelling of 45156131021 in words is "forty-five billion, one hundred fifty-six million, one hundred thirty-one thousand, twenty-one".