31521343525545 has 32 divisors (see below), whose sum is σ = 51310784931840. Its totient is φ = 16519413886400.

The previous prime is 31521343525543. The next prime is 31521343525583. The reversal of 31521343525545 is 54552534312513.

It is not a de Polignac number, because 31521343525545 - 2¹ = 31521343525543 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31521343525494 and 31521343525503.

It is not an unprimeable number, because it can be changed into a prime (31521343525543) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5494299 + ... + 9655568.

It is an arithmetic number, because the mean of its divisors is an integer number (1603462029120).

Almost surely, 2^{31521343525545} is an apocalyptic number.

It is an amenable number.

31521343525545 is a deficient number, since it is larger than the sum of its proper divisors (19789441406295).

31521343525545 is a wasteful number, since it uses less digits than its factorization.

31521343525545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15152285.

The product of its digits is 5400000, while the sum is 48.

The spelling of 31521343525545 in words is "thirty-one trillion, five hundred twenty-one billion, three hundred forty-three million, five hundred twenty-five thousand, five hundred forty-five".