137639693 has 2 divisors, whose sum is σ = 137639694. Its totient is φ = 137639692.

The previous prime is 137639651. The next prime is 137639707. The reversal of 137639693 is 396936731.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 89170249 + 48469444 = 9443^2 + 6962^2 .

It is a cyclic number.

It is not a de Polignac number, because 137639693 - 2²⁶ = 70530829 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (137639893) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68819846 + 68819847.

It is an arithmetic number, because the mean of its divisors is an integer number (68819847).

Almost surely, 2^137639693 is an apocalyptic number.

It is an amenable number.

137639693 is a deficient number, since it is larger than the sum of its proper divisors (1).

137639693 is an equidigital number, since it uses as much as digits as its factorization.

137639693 is an evil number, because the sum of its binary digits is even.

The product of its digits is 551124, while the sum is 47.

The square root of 137639693 is about 11731.9944169779. The cubic root of 137639693 is about 516.3147892429.

The spelling of 137639693 in words is "one hundred thirty-seven million, six hundred thirty-nine thousand, six hundred ninety-three".