31550401013 has 4 divisors (see below), whose sum is σ = 31565564268. Its totient is φ = 31535237760.

The previous prime is 31550400983. The next prime is 31550401021. The reversal of 31550401013 is 31010405513.

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 18676775569 + 12873625444 = 136663^2 + 113462^2 .

It is a cyclic number.

It is not a de Polignac number, because 31550401013 - 2¹⁴ = 31550384629 is a prime.

It is a super-2 number, since 2×31550401013² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31550401013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31550401613) 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, 7578506 + ... + 7582667.

It is an arithmetic number, because the mean of its divisors is an integer number (7891391067).

Almost surely, 2^31550401013 is an apocalyptic number.

It is an amenable number.

31550401013 is a deficient number, since it is larger than the sum of its proper divisors (15163255).

31550401013 is a wasteful number, since it uses less digits than its factorization.

31550401013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15163254.

The product of its (nonzero) digits is 900, while the sum is 23.

Adding to 31550401013 its reverse (31010405513), we get a palindrome (62560806526).

The spelling of 31550401013 in words is "thirty-one billion, five hundred fifty million, four hundred one thousand, thirteen".