137699657 has 2 divisors, whose sum is σ = 137699658. Its totient is φ = 137699656.

The previous prime is 137699647. The next prime is 137699701. The reversal of 137699657 is 756996731.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 80712256 + 56987401 = 8984^2 + 7549^2 .

It is a cyclic number.

It is not a de Polignac number, because 137699657 - 2¹⁸ = 137437513 is a prime.

It is a super-2 number, since 2×137699657² = 37922391075835298, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 137699599 and 137699608.

It is not a weakly prime, because it can be changed into another prime (137699647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68849828 + 68849829.

It is an arithmetic number, because the mean of its divisors is an integer number (68849829).

Almost surely, 2^137699657 is an apocalyptic number.

It is an amenable number.

137699657 is a deficient number, since it is larger than the sum of its proper divisors (1).

137699657 is an equidigital number, since it uses as much as digits as its factorization.

137699657 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2143260, while the sum is 53.

The square root of 137699657 is about 11734.5497144117. The cubic root of 137699657 is about 516.3897574549.

The spelling of 137699657 in words is "one hundred thirty-seven million, six hundred ninety-nine thousand, six hundred fifty-seven".