31019491013 has 6 divisors (see below), whose sum is σ = 36083897766. Its totient is φ = 26588135112.

The previous prime is 31019491007. The next prime is 31019491049.

31019491013 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in only one way, i.e., 30904936804 + 114554209 = 175798^2 + 10703^2 .

It is not a de Polignac number, because 31019491013 - 2¹⁰ = 31019489989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31019491513) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 316525370 + ... + 316525467.

It is an arithmetic number, because the mean of its divisors is an integer number (6013982961).

Almost surely, 2^31019491013 is an apocalyptic number.

It is an amenable number.

31019491013 is a deficient number, since it is larger than the sum of its proper divisors (5064406753).

31019491013 is an equidigital number, since it uses as much as digits as its factorization.

31019491013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 633050851 (or 633050844 counting only the distinct ones).

The product of its (nonzero) digits is 2916, while the sum is 32.

The spelling of 31019491013 in words is "thirty-one billion, nineteen million, four hundred ninety-one thousand, thirteen".