123131731 has 8 divisors (see below), whose sum is σ = 130497264. Its totient is φ = 115779840.

The previous prime is 123131689. The next prime is 123131753. The reversal of 123131731 is 137131321.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 123131731 - 2⁹ = 123131219 is a prime.

It is a super-2 number, since 2×123131731² = 30322846358112722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123131131) 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 7 ways as a sum of consecutive naturals, for example, 19716 + ... + 25198.

It is an arithmetic number, because the mean of its divisors is an integer number (16312158).

Almost surely, 2^123131731 is an apocalyptic number.

123131731 is a deficient number, since it is larger than the sum of its proper divisors (7365533).

123131731 is a wasteful number, since it uses less digits than its factorization.

123131731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6821.

The product of its digits is 378, while the sum is 22.

The square root of 123131731 is about 11096.4738092783. The cubic root of 123131731 is about 497.4964601652.

The spelling of 123131731 in words is "one hundred twenty-three million, one hundred thirty-one thousand, seven hundred thirty-one".