642954619 has 6 divisors (see below), whose sum is σ = 658256676. Its totient is φ = 628000380.

The previous prime is 642954617. The next prime is 642954649. The reversal of 642954619 is 916459246.

It is not a de Polignac number, because 642954619 - 2¹ = 642954617 is a prime.

It is a super-2 number, since 2×642954619² = 826781284186870322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (642954617) 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 in 5 ways as a sum of consecutive naturals, for example, 172017 + ... + 175714.

It is an arithmetic number, because the mean of its divisors is an integer number (109709446).

Almost surely, 2^642954619 is an apocalyptic number.

642954619 is a deficient number, since it is larger than the sum of its proper divisors (15302057).

642954619 is an equidigital number, since it uses as much as digits as its factorization.

642954619 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 347817 (or 347774 counting only the distinct ones).

The product of its digits is 466560, while the sum is 46.

The square root of 642954619 is about 25356.5498244536. The cubic root of 642954619 is about 863.0979933096.

The spelling of 642954619 in words is "six hundred forty-two million, nine hundred fifty-four thousand, six hundred nineteen".