137920357 has 2 divisors, whose sum is σ = 137920358. Its totient is φ = 137920356.

The previous prime is 137920313. The next prime is 137920369. The reversal of 137920357 is 753029731.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 107516161 + 30404196 = 10369^2 + 5514^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-137920357 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (137927357) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68960178 + 68960179.

It is an arithmetic number, because the mean of its divisors is an integer number (68960179).

Almost surely, 2^137920357 is an apocalyptic number.

It is an amenable number.

137920357 is a deficient number, since it is larger than the sum of its proper divisors (1).

137920357 is an equidigital number, since it uses as much as digits as its factorization.

137920357 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 39690, while the sum is 37.

The square root of 137920357 is about 11743.9498040480. The cubic root of 137920357 is about 516.6654937654.

It can be divided in two parts, 1379 and 20357, that added together give a triangular number (21736 = T₂₀₈).

The spelling of 137920357 in words is "one hundred thirty-seven million, nine hundred twenty thousand, three hundred fifty-seven".