31142031997 has 2 divisors, whose sum is σ = 31142031998. Its totient is φ = 31142031996.

The previous prime is 31142031941. The next prime is 31142032003. The reversal of 31142031997 is 79913024113.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 29547547236 + 1594484761 = 171894^2 + 39931^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31142031997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31142031497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15571015998 + 15571015999.

It is an arithmetic number, because the mean of its divisors is an integer number (15571015999).

Almost surely, 2^31142031997 is an apocalyptic number.

It is an amenable number.

31142031997 is a deficient number, since it is larger than the sum of its proper divisors (1).

31142031997 is an equidigital number, since it uses as much as digits as its factorization.

31142031997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40824, while the sum is 40.

The spelling of 31142031997 in words is "thirty-one billion, one hundred forty-two million, thirty-one thousand, nine hundred ninety-seven".