8213648261 has 12 divisors (see below), whose sum is σ = 10164651552. Its totient is φ = 6498709776.

The previous prime is 8213648257. The next prime is 8213648281. The reversal of 8213648261 is 1628463128.

It is not a de Polignac number, because 8213648261 - 2² = 8213648257 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8213648251) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3470351 + ... + 3472716.

It is an arithmetic number, because the mean of its divisors is an integer number (847054296).

Almost surely, 2^8213648261 is an apocalyptic number.

It is an amenable number.

8213648261 is a deficient number, since it is larger than the sum of its proper divisors (1951003291).

8213648261 is a wasteful number, since it uses less digits than its factorization.

8213648261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6943100 (or 6943087 counting only the distinct ones).

The product of its digits is 110592, while the sum is 41.

The square root of 8213648261 is about 90629.1799642919. The cubic root of 8213648261 is about 2017.6478405819.

The spelling of 8213648261 in words is "eight billion, two hundred thirteen million, six hundred forty-eight thousand, two hundred sixty-one".