231142147 has 2 divisors, whose sum is σ = 231142148. Its totient is φ = 231142146.

The previous prime is 231142123. The next prime is 231142187. The reversal of 231142147 is 741241132.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 231142147 - 2²⁷ = 96924419 is a prime.

It is not a weakly prime, because it can be changed into another prime (231142187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115571073 + 115571074.

It is an arithmetic number, because the mean of its divisors is an integer number (115571074).

Almost surely, 2^231142147 is an apocalyptic number.

231142147 is a deficient number, since it is larger than the sum of its proper divisors (1).

231142147 is an equidigital number, since it uses as much as digits as its factorization.

231142147 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1344, while the sum is 25.

The square root of 231142147 is about 15203.3597273761. The cubic root of 231142147 is about 613.7050745070.

Adding to 231142147 its reverse (741241132), we get a palindrome (972383279).

The spelling of 231142147 in words is "two hundred thirty-one million, one hundred forty-two thousand, one hundred forty-seven".