642452971 has 2 divisors, whose sum is σ = 642452972. Its totient is φ = 642452970.

The previous prime is 642452929. The next prime is 642452989. The reversal of 642452971 is 179254246.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 642452971 - 2⁷ = 642452843 is a prime.

It is not a weakly prime, because it can be changed into another prime (642452911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321226485 + 321226486.

It is an arithmetic number, because the mean of its divisors is an integer number (321226486).

Almost surely, 2^642452971 is an apocalyptic number.

642452971 is a deficient number, since it is larger than the sum of its proper divisors (1).

642452971 is an equidigital number, since it uses as much as digits as its factorization.

642452971 is an evil number, because the sum of its binary digits is even.

The product of its digits is 120960, while the sum is 40.

The square root of 642452971 is about 25346.6560121843. The cubic root of 642452971 is about 862.8734652621.

It can be divided in two parts, 6424 and 52971, that added together give a palindrome (59395).

The spelling of 642452971 in words is "six hundred forty-two million, four hundred fifty-two thousand, nine hundred seventy-one".