7891951761 has 12 divisors (see below), whose sum is σ = 11404448640. Its totient is φ = 5259010680.

The previous prime is 7891951757. The next prime is 7891951787. The reversal of 7891951761 is 1671591987.

It is not a de Polignac number, because 7891951761 - 2² = 7891951757 is a prime.

It is a super-2 number, since 2×7891951761² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 7891951698 and 7891951707.

It is not an unprimeable number, because it can be changed into a prime (7891951721) 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, 168921 + ... + 210518.

It is an arithmetic number, because the mean of its divisors is an integer number (950370720).

Almost surely, 2^7891951761 is an apocalyptic number.

It is an amenable number.

7891951761 is a deficient number, since it is larger than the sum of its proper divisors (3512496879).

7891951761 is a wasteful number, since it uses less digits than its factorization.

7891951761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 381756 (or 381753 counting only the distinct ones).

The product of its digits is 952560, while the sum is 54.

The square root of 7891951761 is about 88836.6577545554. The cubic root of 7891951761 is about 1990.9551369728.

The spelling of 7891951761 in words is "seven billion, eight hundred ninety-one million, nine hundred fifty-one thousand, seven hundred sixty-one".