137437657 has 4 divisors (see below), whose sum is σ = 157071616. Its totient is φ = 117803700.

The previous prime is 137437637. The next prime is 137437661. The reversal of 137437657 is 756734731.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 756734731 = 131 ⋅5776601.

It is not a de Polignac number, because 137437657 - 2⁷ = 137437529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (137437637) 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 in 3 ways as a sum of consecutive naturals, for example, 9816969 + ... + 9816982.

It is an arithmetic number, because the mean of its divisors is an integer number (39267904).

Almost surely, 2^137437657 is an apocalyptic number.

It is an amenable number.

137437657 is a deficient number, since it is larger than the sum of its proper divisors (19633959).

137437657 is an equidigital number, since it uses as much as digits as its factorization.

137437657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19633958.

The product of its digits is 370440, while the sum is 43.

The square root of 137437657 is about 11723.3807837159. The cubic root of 137437657 is about 516.0620393427.

The spelling of 137437657 in words is "one hundred thirty-seven million, four hundred thirty-seven thousand, six hundred fifty-seven".