137626561 has 4 divisors (see below), whose sum is σ = 138889300. Its totient is φ = 136363824.

The previous prime is 137626523. The next prime is 137626571. The reversal of 137626561 is 165626731.

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 101626561 + 36000000 = 10081^2 + 6000^2 .

It is a cyclic number.

It is not a de Polignac number, because 137626561 - 2¹⁵ = 137593793 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 137626561.

It is not an unprimeable number, because it can be changed into a prime (137626571) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 631206 + ... + 631423.

It is an arithmetic number, because the mean of its divisors is an integer number (34722325).

Almost surely, 2^137626561 is an apocalyptic number.

It is an amenable number.

137626561 is a deficient number, since it is larger than the sum of its proper divisors (1262739).

137626561 is a wasteful number, since it uses less digits than its factorization.

137626561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1262738.

The product of its digits is 45360, while the sum is 37.

The square root of 137626561 is about 11731.4347374906. The cubic root of 137626561 is about 516.2983684433.

The spelling of 137626561 in words is "one hundred thirty-seven million, six hundred twenty-six thousand, five hundred sixty-one".