31491717432 has 32 divisors (see below), whose sum is σ = 89976336000. Its totient is φ = 8997633504.

The previous prime is 31491717431. The next prime is 31491717449. The reversal of 31491717432 is 23471719413.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31491717431) 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, 93725182 + ... + 93725517.

It is an arithmetic number, because the mean of its divisors is an integer number (2811760500).

Almost surely, 2^31491717432 is an apocalyptic number.

It is an amenable number.

31491717432 is an abundant number, since it is smaller than the sum of its proper divisors (58484618568).

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

31491717432 is a wasteful number, since it uses less digits than its factorization.

31491717432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 187450715 (or 187450711 counting only the distinct ones).

The product of its digits is 127008, while the sum is 42.

The spelling of 31491717432 in words is "thirty-one billion, four hundred ninety-one million, seven hundred seventeen thousand, four hundred thirty-two".