642244351 has 4 divisors (see below), whose sum is σ = 733993552. Its totient is φ = 550495152.

The previous prime is 642244333. The next prime is 642244367. The reversal of 642244351 is 153442246.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 642244351 - 2⁵ = 642244319 is a prime.

It is a super-2 number, since 2×642244351² = 824955612782822402, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642244151) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45874590 + ... + 45874603.

It is an arithmetic number, because the mean of its divisors is an integer number (183498388).

Almost surely, 2^642244351 is an apocalyptic number.

642244351 is a deficient number, since it is larger than the sum of its proper divisors (91749201).

642244351 is an equidigital number, since it uses as much as digits as its factorization.

642244351 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91749200.

The product of its digits is 23040, while the sum is 31.

The square root of 642244351 is about 25342.5403422782. The cubic root of 642244351 is about 862.7800565309.

Adding to 642244351 its reverse (153442246), we get a palindrome (795686597).

The spelling of 642244351 in words is "six hundred forty-two million, two hundred forty-four thousand, three hundred fifty-one".