137579621 has 2 divisors, whose sum is σ = 137579622. Its totient is φ = 137579620.

The previous prime is 137579599. The next prime is 137579677. The reversal of 137579621 is 126975731.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 136656100 + 923521 = 11690^2 + 961^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-137579621 is a prime.

It is a super-2 number, since 2×137579621² = 37856304229007282, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (137579821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68789810 + 68789811.

It is an arithmetic number, because the mean of its divisors is an integer number (68789811).

Almost surely, 2^137579621 is an apocalyptic number.

It is an amenable number.

137579621 is a deficient number, since it is larger than the sum of its proper divisors (1).

137579621 is an equidigital number, since it uses as much as digits as its factorization.

137579621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 79380, while the sum is 41.

The square root of 137579621 is about 11729.4339590621. The cubic root of 137579621 is about 516.2396641713.

The spelling of 137579621 in words is "one hundred thirty-seven million, five hundred seventy-nine thousand, six hundred twenty-one".