31498896561 has 32 divisors (see below), whose sum is σ = 46560175488. Its totient is φ = 18782883840.

The previous prime is 31498896557. The next prime is 31498896619. The reversal of 31498896561 is 16569889413.

It is not a de Polignac number, because 31498896561 - 2² = 31498896557 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31498896495 and 31498896504.

It is not an unprimeable number, because it can be changed into a prime (31498896161) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 480045 + ... + 541701.

It is an arithmetic number, because the mean of its divisors is an integer number (1455005484).

Almost surely, 2^31498896561 is an apocalyptic number.

It is an amenable number.

31498896561 is a deficient number, since it is larger than the sum of its proper divisors (15061278927).

31498896561 is a wasteful number, since it uses less digits than its factorization.

31498896561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61921.

The product of its digits is 11197440, while the sum is 60.

The spelling of 31498896561 in words is "thirty-one billion, four hundred ninety-eight million, eight hundred ninety-six thousand, five hundred sixty-one".