31172073337 has 2 divisors, whose sum is σ = 31172073338. Its totient is φ = 31172073336.

The previous prime is 31172073271. The next prime is 31172073391. The reversal of 31172073337 is 73337027113.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 30619400256 + 552673081 = 174984^2 + 23509^2 .

It is a cyclic number.

It is not a de Polignac number, because 31172073337 - 2¹⁵ = 31172040569 is a prime.

It is a super-2 number, since 2×31172073337² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31172073296 and 31172073305.

It is not a weakly prime, because it can be changed into another prime (31172073937) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15586036668 + 15586036669.

It is an arithmetic number, because the mean of its divisors is an integer number (15586036669).

Almost surely, 2^31172073337 is an apocalyptic number.

It is an amenable number.

31172073337 is a deficient number, since it is larger than the sum of its proper divisors (1).

31172073337 is an equidigital number, since it uses as much as digits as its factorization.

31172073337 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 55566, while the sum is 37.

The spelling of 31172073337 in words is "thirty-one billion, one hundred seventy-two million, seventy-three thousand, three hundred thirty-seven".