31742867521 has 8 divisors (see below), whose sum is σ = 32908859424. Its totient is φ = 30595531680.

The previous prime is 31742867461. The next prime is 31742867549. The reversal of 31742867521 is 12576824713.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-31742867521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31742867561) 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, 4660551 + ... + 4667356.

It is an arithmetic number, because the mean of its divisors is an integer number (4113607428).

Almost surely, 2^31742867521 is an apocalyptic number.

It is an amenable number.

31742867521 is a deficient number, since it is larger than the sum of its proper divisors (1165991903).

31742867521 is an equidigital number, since it uses as much as digits as its factorization.

31742867521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9328031.

The product of its digits is 564480, while the sum is 46.

The spelling of 31742867521 in words is "thirty-one billion, seven hundred forty-two million, eight hundred sixty-seven thousand, five hundred twenty-one".