137247631 has 4 divisors (see below), whose sum is σ = 137655232. Its totient is φ = 136840032.

The previous prime is 137247619. The next prime is 137247637. The reversal of 137247631 is 136742731.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 136742731 = 151 ⋅905581.

It is a cyclic number.

It is not a de Polignac number, because 137247631 - 2⁵ = 137247599 is a prime.

It is a super-2 number, since 2×137247631² = 37673824430224322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (137247637) 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, 203295 + ... + 203968.

It is an arithmetic number, because the mean of its divisors is an integer number (34413808).

Almost surely, 2^137247631 is an apocalyptic number.

137247631 is a deficient number, since it is larger than the sum of its proper divisors (407601).

137247631 is an equidigital number, since it uses as much as digits as its factorization.

137247631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 407600.

The product of its digits is 21168, while the sum is 34.

The square root of 137247631 is about 11715.2734069675. The cubic root of 137247631 is about 515.8240879736.

The spelling of 137247631 in words is "one hundred thirty-seven million, two hundred forty-seven thousand, six hundred thirty-one".