197630521631 has 2 divisors, whose sum is σ = 197630521632. Its totient is φ = 197630521630.

The previous prime is 197630521609. The next prime is 197630521639. The reversal of 197630521631 is 136125036791.

197630521631 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-197630521631 is a prime.

It is a super-2 number, since 2×197630521631² (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 (197630521639) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98815260815 + 98815260816.

It is an arithmetic number, because the mean of its divisors is an integer number (98815260816).

Almost surely, 2^197630521631 is an apocalyptic number.

197630521631 is a deficient number, since it is larger than the sum of its proper divisors (1).

197630521631 is an equidigital number, since it uses as much as digits as its factorization.

197630521631 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 204120, while the sum is 44.

The spelling of 197630521631 in words is "one hundred ninety-seven billion, six hundred thirty million, five hundred twenty-one thousand, six hundred thirty-one".