642579229 has 4 divisors (see below), whose sum is σ = 657522976. Its totient is φ = 627635484.

The previous prime is 642579227. The next prime is 642579239. The reversal of 642579229 is 922975246.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 922975246 = 2 ⋅461487623.

It is a cyclic number.

It is not a de Polignac number, because 642579229 - 2¹ = 642579227 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642579227) 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 3 ways as a sum of consecutive naturals, for example, 7471809 + ... + 7471894.

It is an arithmetic number, because the mean of its divisors is an integer number (164380744).

Almost surely, 2^642579229 is an apocalyptic number.

It is an amenable number.

642579229 is a deficient number, since it is larger than the sum of its proper divisors (14943747).

642579229 is a wasteful number, since it uses less digits than its factorization.

642579229 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14943746.

The product of its digits is 544320, while the sum is 46.

The square root of 642579229 is about 25349.1465142320. The cubic root of 642579229 is about 862.9299869308.

The spelling of 642579229 in words is "six hundred forty-two million, five hundred seventy-nine thousand, two hundred twenty-nine".