137572621 has 2 divisors, whose sum is σ = 137572622. Its totient is φ = 137572620.

The previous prime is 137572613. The next prime is 137572639. The reversal of 137572621 is 126275731.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 136562596 + 1010025 = 11686^2 + 1005^2 .

It is an emirp because it is prime and its reverse (126275731) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 137572621 - 2³ = 137572613 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (137572651) 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 as a sum of consecutive naturals, namely, 68786310 + 68786311.

It is an arithmetic number, because the mean of its divisors is an integer number (68786311).

Almost surely, 2^137572621 is an apocalyptic number.

It is an amenable number.

137572621 is a deficient number, since it is larger than the sum of its proper divisors (1).

137572621 is an equidigital number, since it uses as much as digits as its factorization.

137572621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17640, while the sum is 34.

The square root of 137572621 is about 11729.1355606455. The cubic root of 137572621 is about 516.2309086621.

The spelling of 137572621 in words is "one hundred thirty-seven million, five hundred seventy-two thousand, six hundred twenty-one".