137656861 has 4 divisors (see below), whose sum is σ = 137794300. Its totient is φ = 137519424.

The previous prime is 137656829. The next prime is 137656873. The reversal of 137656861 is 168656731.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 70728100 + 66928761 = 8410^2 + 8181^2 .

It is a cyclic number.

It is not a de Polignac number, because 137656861 - 2⁵ = 137656829 is a prime.

It is a super-2 number, since 2×137656861² = 37898822760746642, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (137656801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 67206 + ... + 69223.

It is an arithmetic number, because the mean of its divisors is an integer number (34448575).

Almost surely, 2^137656861 is an apocalyptic number.

It is an amenable number.

137656861 is a deficient number, since it is larger than the sum of its proper divisors (137439).

137656861 is a wasteful number, since it uses less digits than its factorization.

137656861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137438.

The product of its digits is 181440, while the sum is 43.

The square root of 137656861 is about 11732.7260685657. The cubic root of 137656861 is about 516.3362552498.

The spelling of 137656861 in words is "one hundred thirty-seven million, six hundred fifty-six thousand, eight hundred sixty-one".