197531137 has 2 divisors, whose sum is σ = 197531138. Its totient is φ = 197531136.

The previous prime is 197531111. The next prime is 197531141. The reversal of 197531137 is 731135791.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 166126321 + 31404816 = 12889^2 + 5604^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-197531137 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 197531096 and 197531105.

It is not a weakly prime, because it can be changed into another prime (197531437) 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, 98765568 + 98765569.

It is an arithmetic number, because the mean of its divisors is an integer number (98765569).

Almost surely, 2^197531137 is an apocalyptic number.

It is an amenable number.

197531137 is a deficient number, since it is larger than the sum of its proper divisors (1).

197531137 is an equidigital number, since it uses as much as digits as its factorization.

197531137 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 19845, while the sum is 37.

The square root of 197531137 is about 14054.5770836408. The cubic root of 197531137 is about 582.3872445950.

The spelling of 197531137 in words is "one hundred ninety-seven million, five hundred thirty-one thousand, one hundred thirty-seven".