137431157321 has 4 divisors (see below), whose sum is σ = 137789985792. Its totient is φ = 137072328852.

The previous prime is 137431157287. The next prime is 137431157341. The reversal of 137431157321 is 123751134731.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-137431157321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (137431157341) 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, 179413661 + ... + 179414426.

It is an arithmetic number, because the mean of its divisors is an integer number (34447496448).

Almost surely, 2^137431157321 is an apocalyptic number.

It is an amenable number.

137431157321 is a deficient number, since it is larger than the sum of its proper divisors (358828471).

137431157321 is an equidigital number, since it uses as much as digits as its factorization.

137431157321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 358828470.

The product of its digits is 52920, while the sum is 38.

The spelling of 137431157321 in words is "one hundred thirty-seven billion, four hundred thirty-one million, one hundred fifty-seven thousand, three hundred twenty-one".