245321731 has 2 divisors, whose sum is σ = 245321732. Its totient is φ = 245321730.

The previous prime is 245321723. The next prime is 245321761. The reversal of 245321731 is 137123542.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 245321731 - 2³ = 245321723 is a prime.

It is a super-2 number, since 2×245321731² = 120365503401672722, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 245321731.

It is not a weakly prime, because it can be changed into another prime (245321761) 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 as a sum of consecutive naturals, namely, 122660865 + 122660866.

It is an arithmetic number, because the mean of its divisors is an integer number (122660866).

Almost surely, 2^245321731 is an apocalyptic number.

245321731 is a deficient number, since it is larger than the sum of its proper divisors (1).

245321731 is an equidigital number, since it uses as much as digits as its factorization.

245321731 is an odious number, because the sum of its binary digits is odd.

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

The square root of 245321731 is about 15662.7497905061. The cubic root of 245321731 is about 626.0062561682.

The spelling of 245321731 in words is "two hundred forty-five million, three hundred twenty-one thousand, seven hundred thirty-one".