137697817 has 4 divisors (see below), whose sum is σ = 138315520. Its totient is φ = 137080116.

The previous prime is 137697809. The next prime is 137697853. The reversal of 137697817 is 718796731.

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: 718796731 = 1061 ⋅677471.

It is a cyclic number.

It is not a de Polignac number, because 137697817 - 2³ = 137697809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (137697317) 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, 308517 + ... + 308962.

It is an arithmetic number, because the mean of its divisors is an integer number (34578880).

Almost surely, 2^137697817 is an apocalyptic number.

It is an amenable number.

137697817 is a deficient number, since it is larger than the sum of its proper divisors (617703).

137697817 is an equidigital number, since it uses as much as digits as its factorization.

137697817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 617702.

The product of its digits is 444528, while the sum is 49.

The square root of 137697817 is about 11734.4713131866. The cubic root of 137697817 is about 516.3874573732.

The spelling of 137697817 in words is "one hundred thirty-seven million, six hundred ninety-seven thousand, eight hundred seventeen".