137731823 has 4 divisors (see below), whose sum is σ = 137761848. Its totient is φ = 137701800.

The previous prime is 137731799. The next prime is 137731831. The reversal of 137731823 is 328137731.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 328137731 = 449 ⋅730819.

It is a cyclic number.

It is not a de Polignac number, because 137731823 - 2²² = 133537519 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 (137731873) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6536 + ... + 17837.

It is an arithmetic number, because the mean of its divisors is an integer number (34440462).

Almost surely, 2^137731823 is an apocalyptic number.

137731823 is a deficient number, since it is larger than the sum of its proper divisors (30025).

137731823 is an equidigital number, since it uses as much as digits as its factorization.

137731823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30024.

The product of its digits is 21168, while the sum is 35.

The square root of 137731823 is about 11735.9202025235. The cubic root of 137731823 is about 516.4299630737.

The spelling of 137731823 in words is "one hundred thirty-seven million, seven hundred thirty-one thousand, eight hundred twenty-three".