8642291251 has 8 divisors (see below), whose sum is σ = 9435340800. Its totient is φ = 7850472840.

The previous prime is 8642291221. The next prime is 8642291297. The reversal of 8642291251 is 1521922468.

It is a happy number.

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 8642291251 - 2⁷ = 8642291123 is a prime.

It is a super-2 number, since 2×8642291251² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8642291221) 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, 293071 + ... + 321208.

It is an arithmetic number, because the mean of its divisors is an integer number (1179417600).

Almost surely, 2^8642291251 is an apocalyptic number.

8642291251 is a deficient number, since it is larger than the sum of its proper divisors (793049549).

8642291251 is a wasteful number, since it uses less digits than its factorization.

8642291251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 615569.

The product of its digits is 69120, while the sum is 40.

The square root of 8642291251 is about 92963.9244599753. The cubic root of 8642291251 is about 2052.1525081329.

The spelling of 8642291251 in words is "eight billion, six hundred forty-two million, two hundred ninety-one thousand, two hundred fifty-one".