31919449858 has 16 divisors (see below), whose sum is σ = 49364571384. Its totient is φ = 15467950080.

The previous prime is 31919449853. The next prime is 31919449909. The reversal of 31919449858 is 85894491913.

It can be written as a sum of positive squares in 4 ways, for example, as 28290230809 + 3629219049 = 168197^2 + 60243^2 .

It is a junction number, because it is equal to n+sod(n) for n = 31919449796 and 31919449805.

It is not an unprimeable number, because it can be changed into a prime (31919449853) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 820173 + ... + 858208.

Almost surely, 2^31919449858 is an apocalyptic number.

31919449858 is a deficient number, since it is larger than the sum of its proper divisors (17445121526).

31919449858 is a wasteful number, since it uses less digits than its factorization.

31919449858 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1678677.

The product of its digits is 11197440, while the sum is 61.

The spelling of 31919449858 in words is "thirty-one billion, nine hundred nineteen million, four hundred forty-nine thousand, eight hundred fifty-eight".