137979561 has 8 divisors (see below), whose sum is σ = 188251360. Its totient is φ = 89847072.

The previous prime is 137979559. The next prime is 137979619. The reversal of 137979561 is 165979731.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 137979561 - 2¹ = 137979559 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 137979561.

It is not an unprimeable number, because it can be changed into a prime (137979551) 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 7 ways as a sum of consecutive naturals, for example, 534676 + ... + 534933.

It is an arithmetic number, because the mean of its divisors is an integer number (23531420).

Almost surely, 2^137979561 is an apocalyptic number.

It is an amenable number.

137979561 is a deficient number, since it is larger than the sum of its proper divisors (50271799).

137979561 is a wasteful number, since it uses less digits than its factorization.

137979561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1069655.

The product of its digits is 357210, while the sum is 48.

The square root of 137979561 is about 11746.4701506453. The cubic root of 137979561 is about 516.7394115170.

The spelling of 137979561 in words is "one hundred thirty-seven million, nine hundred seventy-nine thousand, five hundred sixty-one".