8261398321 has 8 divisors (see below), whose sum is σ = 9016117344. Its totient is φ = 7507293120.

The previous prime is 8261398283. The next prime is 8261398337. The reversal of 8261398321 is 1238931628.

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 8261398321 - 2¹⁹ = 8260874033 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8261395321) 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, 125080 + ... + 179353.

It is an arithmetic number, because the mean of its divisors is an integer number (1127014668).

Almost surely, 2^8261398321 is an apocalyptic number.

It is an amenable number.

8261398321 is a deficient number, since it is larger than the sum of its proper divisors (754719023).

8261398321 is a wasteful number, since it uses less digits than its factorization.

8261398321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 306911.

The product of its digits is 124416, while the sum is 43.

The square root of 8261398321 is about 90892.2346573127. The cubic root of 8261398321 is about 2021.5501548228.

The spelling of 8261398321 in words is "eight billion, two hundred sixty-one million, three hundred ninety-eight thousand, three hundred twenty-one".