197312537 has 2 divisors, whose sum is σ = 197312538. Its totient is φ = 197312536.

The previous prime is 197312449. The next prime is 197312569. The reversal of 197312537 is 735213791.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 191241241 + 6071296 = 13829^2 + 2464^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-197312537 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 197312537.

It is not a weakly prime, because it can be changed into another prime (197312597) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98656268 + 98656269.

It is an arithmetic number, because the mean of its divisors is an integer number (98656269).

Almost surely, 2^197312537 is an apocalyptic number.

It is an amenable number.

197312537 is a deficient number, since it is larger than the sum of its proper divisors (1).

197312537 is an equidigital number, since it uses as much as digits as its factorization.

197312537 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 39690, while the sum is 38.

The square root of 197312537 is about 14046.7981049063. The cubic root of 197312537 is about 582.1723302184.

The spelling of 197312537 in words is "one hundred ninety-seven million, three hundred twelve thousand, five hundred thirty-seven".