642434351 has 8 divisors (see below), whose sum is σ = 692957664. Its totient is φ = 592068960.

The previous prime is 642434347. The next prime is 642434363. The reversal of 642434351 is 153434246.

642434351 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 642434351 - 2² = 642434347 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642434311) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30956 + ... + 47361.

It is an arithmetic number, because the mean of its divisors is an integer number (86619708).

Almost surely, 2^642434351 is an apocalyptic number.

642434351 is a deficient number, since it is larger than the sum of its proper divisors (50523313).

642434351 is a wasteful number, since it uses less digits than its factorization.

642434351 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78961.

The product of its digits is 34560, while the sum is 32.

The square root of 642434351 is about 25346.2887026878. The cubic root of 642434351 is about 862.8651290571.

Adding to 642434351 its reverse (153434246), we get a palindrome (795868597).

The spelling of 642434351 in words is "six hundred forty-two million, four hundred thirty-four thousand, three hundred fifty-one".