642905119 has 2 divisors, whose sum is σ = 642905120. Its totient is φ = 642905118.

The previous prime is 642905069. The next prime is 642905129. The reversal of 642905119 is 911509246.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 642905119 - 2⁷ = 642904991 is a prime.

It is a super-2 number, since 2×642905119² = 826653984072808322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (642905129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321452559 + 321452560.

It is an arithmetic number, because the mean of its divisors is an integer number (321452560).

Almost surely, 2^642905119 is an apocalyptic number.

642905119 is a deficient number, since it is larger than the sum of its proper divisors (1).

642905119 is an equidigital number, since it uses as much as digits as its factorization.

642905119 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 19440, while the sum is 37.

The square root of 642905119 is about 25355.5737265005. The cubic root of 642905119 is about 863.0758432512.

The spelling of 642905119 in words is "six hundred forty-two million, nine hundred five thousand, one hundred nineteen".