231253139 has 4 divisors (see below), whose sum is σ = 249041856. Its totient is φ = 213464424.

The previous prime is 231253133. The next prime is 231253147. The reversal of 231253139 is 931352132.

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

It is a cyclic number.

It is not a de Polignac number, because 231253139 - 2¹⁶ = 231187603 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231253133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8894339 + ... + 8894364.

It is an arithmetic number, because the mean of its divisors is an integer number (62260464).

Almost surely, 2^231253139 is an apocalyptic number.

231253139 is a deficient number, since it is larger than the sum of its proper divisors (17788717).

231253139 is a wasteful number, since it uses less digits than its factorization.

231253139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17788716.

The product of its digits is 4860, while the sum is 29.

The square root of 231253139 is about 15207.0095350795. The cubic root of 231253139 is about 613.8032903373.

The spelling of 231253139 in words is "two hundred thirty-one million, two hundred fifty-three thousand, one hundred thirty-nine".