642950311 has 2 divisors, whose sum is σ = 642950312. Its totient is φ = 642950310.

The previous prime is 642950281. The next prime is 642950339. The reversal of 642950311 is 113059246.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 642950311 - 2⁹ = 642949799 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (642956311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321475155 + 321475156.

It is an arithmetic number, because the mean of its divisors is an integer number (321475156).

Almost surely, 2^642950311 is an apocalyptic number.

642950311 is a deficient number, since it is larger than the sum of its proper divisors (1).

642950311 is an equidigital number, since it uses as much as digits as its factorization.

642950311 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 642950311 is about 25356.4648758458. The cubic root of 642950311 is about 863.0960656285.

The spelling of 642950311 in words is "six hundred forty-two million, nine hundred fifty thousand, three hundred eleven".