31520451036 has 12 divisors (see below), whose sum is σ = 73547719112. Its totient is φ = 10506817008.

The previous prime is 31520450981. The next prime is 31520451037. The reversal of 31520451036 is 63015402513.

It is a tau number, because it is divible by the number of its divisors (12).

It is a junction number, because it is equal to n+sod(n) for n = 31520450994 and 31520451012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31520451037) 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, 1313352115 + ... + 1313352138.

Almost surely, 2^31520451036 is an apocalyptic number.

It is an amenable number.

31520451036 is an abundant number, since it is smaller than the sum of its proper divisors (42027268076).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31520451036 is a wasteful number, since it uses less digits than its factorization.

31520451036 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2626704260 (or 2626704258 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 30.

Adding to 31520451036 its reverse (63015402513), we get a palindrome (94535853549).

The spelling of 31520451036 in words is "thirty-one billion, five hundred twenty million, four hundred fifty-one thousand, thirty-six".