31172073689 has 2 divisors, whose sum is σ = 31172073690. Its totient is φ = 31172073688.

The previous prime is 31172073671. The next prime is 31172073703. The reversal of 31172073689 is 98637027113.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27392898064 + 3779175625 = 165508^2 + 61475^2 .

It is a cyclic number.

It is not a de Polignac number, because 31172073689 - 2⁸ = 31172073433 is a prime.

It is not a weakly prime, because it can be changed into another prime (31172573689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15586036844 + 15586036845.

It is an arithmetic number, because the mean of its divisors is an integer number (15586036845).

Almost surely, 2^31172073689 is an apocalyptic number.

It is an amenable number.

31172073689 is a deficient number, since it is larger than the sum of its proper divisors (1).

31172073689 is an equidigital number, since it uses as much as digits as its factorization.

31172073689 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 381024, while the sum is 47.

The spelling of 31172073689 in words is "thirty-one billion, one hundred seventy-two million, seventy-three thousand, six hundred eighty-nine".