71997000031 has 32 divisors (see below), whose sum is σ = 81259718400. Its totient is φ = 63221664000.

The previous prime is 71996999989. The next prime is 71997000037. The reversal of 71997000031 is 13000079917.

It is not a de Polignac number, because 71997000031 - 2⁷ = 71996999903 is a prime.

It is a super-2 number, since 2×71997000031² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71997000037) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 26265321 + ... + 26268061.

It is an arithmetic number, because the mean of its divisors is an integer number (2539366200).

Almost surely, 2^71997000031 is an apocalyptic number.

71997000031 is the 119998-th centered decagonal number.

71997000031 is a deficient number, since it is larger than the sum of its proper divisors (9262718369).

71997000031 is a wasteful number, since it uses less digits than its factorization.

71997000031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3351.

The product of its (nonzero) digits is 11907, while the sum is 37.

Adding to 71997000031 its reverse (13000079917), we get a palindrome (84997079948).

The spelling of 71997000031 in words is "seventy-one billion, nine hundred ninety-seven million, thirty-one", and thus it is an aban number.