31545031013 has 4 divisors (see below), whose sum is σ = 31549874988. Its totient is φ = 31540187040.

The previous prime is 31545030971. The next prime is 31545031051. The reversal of 31545031013 is 31013054513.

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

It can be written as a sum of positive squares in 2 ways, for example, as 12450765889 + 19094265124 = 111583^2 + 138182^2 .

It is a cyclic number.

It is not a de Polignac number, because 31545031013 - 2¹² = 31545026917 is a prime.

It is a super-2 number, since 2×31545031013² (a number of 22 digits) 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 (31545031073) 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, 2412206 + ... + 2425247.

It is an arithmetic number, because the mean of its divisors is an integer number (7887468747).

Almost surely, 2^31545031013 is an apocalyptic number.

It is an amenable number.

31545031013 is a deficient number, since it is larger than the sum of its proper divisors (4843975).

31545031013 is an equidigital number, since it uses as much as digits as its factorization.

31545031013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4843974.

The product of its (nonzero) digits is 2700, while the sum is 26.

Adding to 31545031013 its reverse (31013054513), we get a palindrome (62558085526).

The spelling of 31545031013 in words is "thirty-one billion, five hundred forty-five million, thirty-one thousand, thirteen".