137615813 has 4 divisors (see below), whose sum is σ = 138527328. Its totient is φ = 136704300.

The previous prime is 137615809. The next prime is 137615843. The reversal of 137615813 is 318516731.

137615813 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 not a de Polignac number, because 137615813 - 2² = 137615809 is a prime.

It is a super-2 number, since 2×137615813² = 37876223975301938, 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 (137615843) 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, 455531 + ... + 455832.

It is an arithmetic number, because the mean of its divisors is an integer number (34631832).

Almost surely, 2^137615813 is an apocalyptic number.

It is an amenable number.

137615813 is a deficient number, since it is larger than the sum of its proper divisors (911515).

137615813 is an equidigital number, since it uses as much as digits as its factorization.

137615813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 911514.

The product of its digits is 15120, while the sum is 35.

The square root of 137615813 is about 11730.9766430592. The cubic root of 137615813 is about 516.2849279192.

The spelling of 137615813 in words is "one hundred thirty-seven million, six hundred fifteen thousand, eight hundred thirteen".