31000089997 has 2 divisors, whose sum is σ = 31000089998. Its totient is φ = 31000089996.

The previous prime is 31000089979. The next prime is 31000090003. The reversal of 31000089997 is 79998000013.

Together with previous prime (31000089979) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26891408196 + 4108681801 = 163986^2 + 64099^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31000089997 is a prime.

It is a super-2 number, since 2×31000089997² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31000089937) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15500044998 + 15500044999.

It is an arithmetic number, because the mean of its divisors is an integer number (15500044999).

Almost surely, 2^31000089997 is an apocalyptic number.

It is an amenable number.

31000089997 is a deficient number, since it is larger than the sum of its proper divisors (1).

31000089997 is an equidigital number, since it uses as much as digits as its factorization.

31000089997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 122472, while the sum is 46.

The spelling of 31000089997 in words is "thirty-one billion, eighty-nine thousand, nine hundred ninety-seven".