642263311 has 2 divisors, whose sum is σ = 642263312. Its totient is φ = 642263310.

The previous prime is 642263309. The next prime is 642263333. The reversal of 642263311 is 113362246.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 642263311 - 2¹ = 642263309 is a prime.

Together with 642263309, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 642263311.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (642263371) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321131655 + 321131656.

It is an arithmetic number, because the mean of its divisors is an integer number (321131656).

Almost surely, 2^642263311 is an apocalyptic number.

642263311 is a deficient number, since it is larger than the sum of its proper divisors (1).

642263311 is an equidigital number, since it uses as much as digits as its factorization.

642263311 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5184, while the sum is 28.

The square root of 642263311 is about 25342.9144140922. The cubic root of 642263311 is about 862.7885466271.

The spelling of 642263311 in words is "six hundred forty-two million, two hundred sixty-three thousand, three hundred eleven".