642212099 has 2 divisors, whose sum is σ = 642212100. Its totient is φ = 642212098.

The previous prime is 642212059. The next prime is 642212113. The reversal of 642212099 is 990212246.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 642212099 - 2²⁸ = 373776643 is a prime.

It is a Chen prime.

It is equal to p_33409556 and since 642212099 and 33409556 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (642212029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321106049 + 321106050.

It is an arithmetic number, because the mean of its divisors is an integer number (321106050).

Almost surely, 2^642212099 is an apocalyptic number.

642212099 is a deficient number, since it is larger than the sum of its proper divisors (1).

642212099 is an equidigital number, since it uses as much as digits as its factorization.

642212099 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15552, while the sum is 35.

The square root of 642212099 is about 25341.9040129190. The cubic root of 642212099 is about 862.7656140278.

The spelling of 642212099 in words is "six hundred forty-two million, two hundred twelve thousand, ninety-nine".