642968297 has 2 divisors, whose sum is σ = 642968298. Its totient is φ = 642968296.

The previous prime is 642968267. The next prime is 642968311. The reversal of 642968297 is 792869246.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 641659561 + 1308736 = 25331^2 + 1144^2 .

It is a cyclic number.

It is not a de Polignac number, because 642968297 - 2²⁶ = 575859433 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (642968267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321484148 + 321484149.

It is an arithmetic number, because the mean of its divisors is an integer number (321484149).

Almost surely, 2^642968297 is an apocalyptic number.

It is an amenable number.

642968297 is a deficient number, since it is larger than the sum of its proper divisors (1).

642968297 is an equidigital number, since it uses as much as digits as its factorization.

642968297 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2612736, while the sum is 53.

The square root of 642968297 is about 25356.8195363693. The cubic root of 642968297 is about 863.1041136849.

The spelling of 642968297 in words is "six hundred forty-two million, nine hundred sixty-eight thousand, two hundred ninety-seven".