137872457 has 2 divisors, whose sum is σ = 137872458. Its totient is φ = 137872456.

The previous prime is 137872447. The next prime is 137872477. The reversal of 137872457 is 754278731.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 80658361 + 57214096 = 8981^2 + 7564^2 .

It is an emirp because it is prime and its reverse (754278731) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 137872457 - 2⁶ = 137872393 is a prime.

It is not a weakly prime, because it can be changed into another prime (137872447) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68936228 + 68936229.

It is an arithmetic number, because the mean of its divisors is an integer number (68936229).

Almost surely, 2^137872457 is an apocalyptic number.

It is an amenable number.

137872457 is a deficient number, since it is larger than the sum of its proper divisors (1).

137872457 is an equidigital number, since it uses as much as digits as its factorization.

137872457 is an evil number, because the sum of its binary digits is even.

The product of its digits is 329280, while the sum is 44.

The square root of 137872457 is about 11741.9102789963. The cubic root of 137872457 is about 516.6056738730.

The spelling of 137872457 in words is "one hundred thirty-seven million, eight hundred seventy-two thousand, four hundred fifty-seven".