231220739 has 2 divisors, whose sum is σ = 231220740. Its totient is φ = 231220738.

The previous prime is 231220727. The next prime is 231220753. The reversal of 231220739 is 937022132.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-231220739 is a prime.

It is a super-2 number, since 2×231220739² = 106926060287412242, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (231226739) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115610369 + 115610370.

It is an arithmetic number, because the mean of its divisors is an integer number (115610370).

Almost surely, 2^231220739 is an apocalyptic number.

231220739 is a deficient number, since it is larger than the sum of its proper divisors (1).

231220739 is an equidigital number, since it uses as much as digits as its factorization.

231220739 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4536, while the sum is 29.

The square root of 231220739 is about 15205.9441995556. The cubic root of 231220739 is about 613.7746231150.

The spelling of 231220739 in words is "two hundred thirty-one million, two hundred twenty thousand, seven hundred thirty-nine".