137990197 has 2 divisors, whose sum is σ = 137990198. Its totient is φ = 137990196.

The previous prime is 137990191. The next prime is 137990227. The reversal of 137990197 is 791099731.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 130667761 + 7322436 = 11431^2 + 2706^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-137990197 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (137990191) 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, 68995098 + 68995099.

It is an arithmetic number, because the mean of its divisors is an integer number (68995099).

Almost surely, 2^137990197 is an apocalyptic number.

It is an amenable number.

137990197 is a deficient number, since it is larger than the sum of its proper divisors (1).

137990197 is an equidigital number, since it uses as much as digits as its factorization.

137990197 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 107163, while the sum is 46.

The square root of 137990197 is about 11746.9228736721. The cubic root of 137990197 is about 516.7526886023.

The spelling of 137990197 in words is "one hundred thirty-seven million, nine hundred ninety thousand, one hundred ninety-seven".