197649527437 has 2 divisors, whose sum is σ = 197649527438. Its totient is φ = 197649527436.

The previous prime is 197649527401. The next prime is 197649527443. The reversal of 197649527437 is 734725946791.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 163459298601 + 34190228836 = 404301^2 + 184906^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-197649527437 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (197649507437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98824763718 + 98824763719.

It is an arithmetic number, because the mean of its divisors is an integer number (98824763719).

Almost surely, 2^197649527437 is an apocalyptic number.

It is an amenable number.

197649527437 is a deficient number, since it is larger than the sum of its proper divisors (1).

197649527437 is an equidigital number, since it uses as much as digits as its factorization.

197649527437 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 80015040, while the sum is 64.

The spelling of 197649527437 in words is "one hundred ninety-seven billion, six hundred forty-nine million, five hundred twenty-seven thousand, four hundred thirty-seven".