197005921631 has 2 divisors, whose sum is σ = 197005921632. Its totient is φ = 197005921630.

The previous prime is 197005921613. The next prime is 197005921657. The reversal of 197005921631 is 136129500791.

Together with previous prime (197005921613) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-197005921631 is a prime.

It is a super-2 number, since 2×197005921631² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (197005921691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98502960815 + 98502960816.

It is an arithmetic number, because the mean of its divisors is an integer number (98502960816).

Almost surely, 2^197005921631 is an apocalyptic number.

197005921631 is a deficient number, since it is larger than the sum of its proper divisors (1).

197005921631 is an equidigital number, since it uses as much as digits as its factorization.

197005921631 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 102060, while the sum is 44.

The spelling of 197005921631 in words is "one hundred ninety-seven billion, five million, nine hundred twenty-one thousand, six hundred thirty-one".