7775881 has 2 divisors, whose sum is σ = 7775882. Its totient is φ = 7775880.

The previous prime is 7775879. The next prime is 7775893. The reversal of 7775881 is 1885777.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7070281 + 705600 = 2659^2 + 840^2 .

It is a cyclic number.

It is not a de Polignac number, because 7775881 - 2¹ = 7775879 is a prime.

It is a super-2 number, since 2×7775881² = 120928650652322, which contains 22 as substring.

Together with 7775879, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (7775861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3887940 + 3887941.

It is an arithmetic number, because the mean of its divisors is an integer number (3887941).

Almost surely, 2^7775881 is an apocalyptic number.

It is an amenable number.

7775881 is a deficient number, since it is larger than the sum of its proper divisors (1).

7775881 is an equidigital number, since it uses as much as digits as its factorization.

7775881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 109760, while the sum is 43.

The square root of 7775881 is about 2788.5266719183. The cubic root of 7775881 is about 198.1146243078.

The spelling of 7775881 in words is "seven million, seven hundred seventy-five thousand, eight hundred eighty-one".