8191379449261 has 32 divisors (see below), whose sum is σ = 8367583150080. Its totient is φ = 8017375766400.

The previous prime is 8191379449189. The next prime is 8191379449333. The reversal of 8191379449261 is 1629449731918.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (8191379449189) and next prime (8191379449333).

It is a cyclic number.

It is not a de Polignac number, because 8191379449261 - 2²⁵ = 8191345894829 is a prime.

It is a super-2 number, since 2×8191379449261² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 8191379449193 and 8191379449202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8191379449661) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6654247516 + ... + 6654248746.

It is an arithmetic number, because the mean of its divisors is an integer number (261486973440).

Almost surely, 2^{8191379449261} is an apocalyptic number.

It is an amenable number.

8191379449261 is a deficient number, since it is larger than the sum of its proper divisors (176203700819).

8191379449261 is a wasteful number, since it uses less digits than its factorization.

8191379449261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2785.

The product of its digits is 23514624, while the sum is 64.

The spelling of 8191379449261 in words is "eight trillion, one hundred ninety-one billion, three hundred seventy-nine million, four hundred forty-nine thousand, two hundred sixty-one".