31172073289 has 12 divisors (see below), whose sum is σ = 36620420868. Its totient is φ = 26454372000.

The previous prime is 31172073271. The next prime is 31172073337. The reversal of 31172073289 is 98237027113.

It can be written as a sum of positive squares in 2 ways, for example, as 25069338889 + 6102734400 = 158333^2 + 78120^2 .

It is not a de Polignac number, because 31172073289 - 2¹¹ = 31172071241 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31172073689) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3144382 + ... + 3154279.

It is an arithmetic number, because the mean of its divisors is an integer number (3051701739).

Almost surely, 2^31172073289 is an apocalyptic number.

It is an amenable number.

31172073289 is a deficient number, since it is larger than the sum of its proper divisors (5448347579).

31172073289 is a wasteful number, since it uses less digits than its factorization.

31172073289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6298776 (or 6298769 counting only the distinct ones).

The product of its (nonzero) digits is 127008, while the sum is 43.

The spelling of 31172073289 in words is "thirty-one billion, one hundred seventy-two million, seventy-three thousand, two hundred eighty-nine".