137373731 has 4 divisors (see below), whose sum is σ = 149862264. Its totient is φ = 124885200.

The previous prime is 137373707. The next prime is 137373737.

137373731 is nontrivially palindromic in base 10.

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

It is a de Polignac number, because none of the positive numbers 2^k-137373731 is a prime.

It is a super-2 number, since 2×137373731² = 37743083937720722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 137373691 and 137373700.

It is not an unprimeable number, because it can be changed into a prime (137373737) 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, 6244250 + ... + 6244271.

It is an arithmetic number, because the mean of its divisors is an integer number (37465566).

Almost surely, 2^137373731 is an apocalyptic number.

137373731 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

137373731 is a deficient number, since it is larger than the sum of its proper divisors (12488533).

137373731 is a wasteful number, since it uses less digits than its factorization.

137373731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12488532.

The product of its digits is 27783, while the sum is 35.

The square root of 137373731 is about 11720.6540346518. The cubic root of 137373731 is about 515.9820154279.

The spelling of 137373731 in words is "one hundred thirty-seven million, three hundred seventy-three thousand, seven hundred thirty-one".