642527231 has 2 divisors, whose sum is σ = 642527232. Its totient is φ = 642527230.

The previous prime is 642527191. The next prime is 642527251. The reversal of 642527231 is 132725246.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 642527231 - 2⁶ = 642527167 is a prime.

It is a super-2 number, since 2×642527231² = 825682485153054722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (642527251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321263615 + 321263616.

It is an arithmetic number, because the mean of its divisors is an integer number (321263616).

Almost surely, 2^642527231 is an apocalyptic number.

642527231 is a deficient number, since it is larger than the sum of its proper divisors (1).

642527231 is an equidigital number, since it uses as much as digits as its factorization.

642527231 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20160, while the sum is 32.

The square root of 642527231 is about 25348.1208573732. The cubic root of 642527231 is about 862.9067099860.

The spelling of 642527231 in words is "six hundred forty-two million, five hundred twenty-seven thousand, two hundred thirty-one".