137231557 has 4 divisors (see below), whose sum is σ = 140940556. Its totient is φ = 133522560.

The previous prime is 137231537. The next prime is 137231597. The reversal of 137231557 is 755132731.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 104980516 + 32251041 = 10246^2 + 5679^2 .

It is a cyclic number.

It is not a de Polignac number, because 137231557 - 2¹¹ = 137229509 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (137231537) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1854444 + ... + 1854517.

It is an arithmetic number, because the mean of its divisors is an integer number (35235139).

Almost surely, 2^137231557 is an apocalyptic number.

It is an amenable number.

137231557 is a deficient number, since it is larger than the sum of its proper divisors (3708999).

137231557 is an equidigital number, since it uses as much as digits as its factorization.

137231557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3708998.

The product of its digits is 22050, while the sum is 34.

The square root of 137231557 is about 11714.5873593567. The cubic root of 137231557 is about 515.8039499695.

The spelling of 137231557 in words is "one hundred thirty-seven million, two hundred thirty-one thousand, five hundred fifty-seven".