31498086731 has 4 divisors (see below), whose sum is σ = 31500558600. Its totient is φ = 31495614864.

The previous prime is 31498086637. The next prime is 31498086749. The reversal of 31498086731 is 13768089413.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31498086731 is a prime.

It is a super-2 number, since 2×31498086731² (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 31498086731.

It is not an unprimeable number, because it can be changed into a prime (31498026731) 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, 1216721 + ... + 1242338.

It is an arithmetic number, because the mean of its divisors is an integer number (7875139650).

Almost surely, 2^31498086731 is an apocalyptic number.

31498086731 is a deficient number, since it is larger than the sum of its proper divisors (2471869).

31498086731 is a wasteful number, since it uses less digits than its factorization.

31498086731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2471868.

The product of its (nonzero) digits is 870912, while the sum is 50.

The spelling of 31498086731 in words is "thirty-one billion, four hundred ninety-eight million, eighty-six thousand, seven hundred thirty-one".