31491717480 has 48 divisors (see below), whose sum is σ = 102348082980. Its totient is φ = 8397791232.

The previous prime is 31491717479. The next prime is 31491717559. The reversal of 31491717480 is 8471719413.

31491717480 is a `hidden beast` number, since 3 + 14 + 91 + 71 + 7 + 480 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 25627527396 + 5864190084 = 160086^2 + 76578^2 .

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 43738137 + ... + 43738856.

Almost surely, 2^31491717480 is an apocalyptic number.

31491717480 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31491717480 is an abundant number, since it is smaller than the sum of its proper divisors (70856365500).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31491717480 is a wasteful number, since it uses less digits than its factorization.

31491717480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87477010 (or 87477003 counting only the distinct ones).

The product of its (nonzero) digits is 169344, while the sum is 45.

The spelling of 31491717480 in words is "thirty-one billion, four hundred ninety-one million, seven hundred seventeen thousand, four hundred eighty".