31542671197391 has 4 divisors (see below), whose sum is σ = 31543306765152. Its totient is φ = 31542035629632.

The previous prime is 31542671197357. The next prime is 31542671197459. The reversal of 31542671197391 is 19379117624513.

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-31542671197391 is a prime.

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 31542671197391.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31542671197091) 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, 317709431 + ... + 317808696.

It is an arithmetic number, because the mean of its divisors is an integer number (7885826691288).

Almost surely, 2^{31542671197391} is an apocalyptic number.

31542671197391 is a deficient number, since it is larger than the sum of its proper divisors (635567761).

31542671197391 is an equidigital number, since it uses as much as digits as its factorization.

31542671197391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 635567760.

The product of its digits is 8573040, while the sum is 59.

The spelling of 31542671197391 in words is "thirty-one trillion, five hundred forty-two billion, six hundred seventy-one million, one hundred ninety-seven thousand, three hundred ninety-one".