5251621894 has 8 divisors (see below), whose sum is σ = 7877840040. Its totient is φ = 2625675216.

The previous prime is 5251621883. The next prime is 5251621909. The reversal of 5251621894 is 4981261525.

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

It is a self number, because there is not a number n which added to its sum of digits gives 5251621894.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9444 + ... + 102919.

It is an arithmetic number, because the mean of its divisors is an integer number (984730005).

Almost surely, 2^5251621894 is an apocalyptic number.

5251621894 is a deficient number, since it is larger than the sum of its proper divisors (2626218146).

5251621894 is a wasteful number, since it uses less digits than its factorization.

5251621894 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135734.

The product of its digits is 172800, while the sum is 43.

The square root of 5251621894 is about 72468.0749985813. The cubic root of 5251621894 is about 1738.1922801035.

The spelling of 5251621894 in words is "five billion, two hundred fifty-one million, six hundred twenty-one thousand, eight hundred ninety-four".