137621291 has 2 divisors, whose sum is σ = 137621292. Its totient is φ = 137621290.

The previous prime is 137621261. The next prime is 137621299. The reversal of 137621291 is 192126731.

It is a strong prime.

It is an emirp because it is prime and its reverse (192126731) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 137621291 - 2⁶ = 137621227 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (137621299) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68810645 + 68810646.

It is an arithmetic number, because the mean of its divisors is an integer number (68810646).

Almost surely, 2^137621291 is an apocalyptic number.

137621291 is a deficient number, since it is larger than the sum of its proper divisors (1).

137621291 is an equidigital number, since it uses as much as digits as its factorization.

137621291 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4536, while the sum is 32.

The square root of 137621291 is about 11731.2101251320. The cubic root of 137621291 is about 516.2917783221.

The spelling of 137621291 in words is "one hundred thirty-seven million, six hundred twenty-one thousand, two hundred ninety-one".