646238451 has 8 divisors (see below), whose sum is σ = 862519504. Its totient is φ = 430391520.

The previous prime is 646238449. The next prime is 646238473. The reversal of 646238451 is 154832646.

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

It is not a de Polignac number, because 646238451 - 2¹ = 646238449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (646238491) 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, 105040 + ... + 111021.

It is an arithmetic number, because the mean of its divisors is an integer number (107814938).

Almost surely, 2^646238451 is an apocalyptic number.

646238451 is a deficient number, since it is larger than the sum of its proper divisors (216281053).

646238451 is a wasteful number, since it uses less digits than its factorization.

646238451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 217061.

The product of its digits is 138240, while the sum is 39.

The square root of 646238451 is about 25421.2204860428. The cubic root of 646238451 is about 864.5648968383.

The spelling of 646238451 in words is "six hundred forty-six million, two hundred thirty-eight thousand, four hundred fifty-one".