31545020553 has 4 divisors (see below), whose sum is σ = 42060027408. Its totient is φ = 21030013700.

The previous prime is 31545020539. The next prime is 31545020557. The reversal of 31545020553 is 35502054513.

It is a happy number.

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 an emirpimes, since its reverse is a distinct semiprime: 35502054513 = 3 ⋅11834018171.

It is a cyclic number.

It is not a de Polignac number, because 31545020553 - 2⁶ = 31545020489 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31545020557) 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, 5257503423 + ... + 5257503428.

It is an arithmetic number, because the mean of its divisors is an integer number (10515006852).

Almost surely, 2^31545020553 is an apocalyptic number.

It is an amenable number.

31545020553 is a deficient number, since it is larger than the sum of its proper divisors (10515006855).

31545020553 is a wasteful number, since it uses less digits than its factorization.

31545020553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10515006854.

The product of its (nonzero) digits is 45000, while the sum is 33.

The spelling of 31545020553 in words is "thirty-one billion, five hundred forty-five million, twenty thousand, five hundred fifty-three".