231142735 has 4 divisors (see below), whose sum is σ = 277371288. Its totient is φ = 184914184.

The previous prime is 231142711. The next prime is 231142739. The reversal of 231142735 is 537241132.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-231142735 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 (231142739) 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, 23114269 + ... + 23114278.

It is an arithmetic number, because the mean of its divisors is an integer number (69342822).

Almost surely, 2^231142735 is an apocalyptic number.

231142735 is a deficient number, since it is larger than the sum of its proper divisors (46228553).

231142735 is an equidigital number, since it uses as much as digits as its factorization.

231142735 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46228552.

The product of its digits is 5040, while the sum is 28.

The square root of 231142735 is about 15203.3790651947. The cubic root of 231142735 is about 613.7055949058.

Adding to 231142735 its reverse (537241132), we get a palindrome (768383867).

The spelling of 231142735 in words is "two hundred thirty-one million, one hundred forty-two thousand, seven hundred thirty-five".