642084511 has 2 divisors, whose sum is σ = 642084512. Its totient is φ = 642084510.

The previous prime is 642084479. The next prime is 642084533. The reversal of 642084511 is 115480246.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 642084511 - 2⁵ = 642084479 is a prime.

It is a super-2 number, since 2×642084511² = 824545038532218242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (642084581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321042255 + 321042256.

It is an arithmetic number, because the mean of its divisors is an integer number (321042256).

Almost surely, 2^642084511 is an apocalyptic number.

642084511 is a deficient number, since it is larger than the sum of its proper divisors (1).

642084511 is an equidigital number, since it uses as much as digits as its factorization.

642084511 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7680, while the sum is 31.

The square root of 642084511 is about 25339.3865553213. The cubic root of 642084511 is about 862.7084751532.

The spelling of 642084511 in words is "six hundred forty-two million, eighty-four thousand, five hundred eleven".