6402189251 has 4 divisors (see below), whose sum is σ = 6739146600. Its totient is φ = 6065231904.

The previous prime is 6402189193. The next prime is 6402189281. The reversal of 6402189251 is 1529812046.

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 6402189251 - 2⁶ = 6402189187 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6402189281) 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, 168478646 + ... + 168478683.

It is an arithmetic number, because the mean of its divisors is an integer number (1684786650).

Almost surely, 2^6402189251 is an apocalyptic number.

6402189251 is a deficient number, since it is larger than the sum of its proper divisors (336957349).

6402189251 is a wasteful number, since it uses less digits than its factorization.

6402189251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 336957348.

The product of its (nonzero) digits is 34560, while the sum is 38.

The square root of 6402189251 is about 80013.6816488280. The cubic root of 6402189251 is about 1856.8472093733.

The spelling of 6402189251 in words is "six billion, four hundred two million, one hundred eighty-nine thousand, two hundred fifty-one".