771888091 has 16 divisors (see below), whose sum is σ = 889862400. Its totient is φ = 663558048.

The previous prime is 771888031. The next prime is 771888101. The reversal of 771888091 is 190888177.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-771888091 is a prime.

It is a super-2 number, since 2×771888091² = 1191622450055248562, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (771888031) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11911 + ... + 41056.

It is an arithmetic number, because the mean of its divisors is an integer number (55616400).

Almost surely, 2^771888091 is an apocalyptic number.

771888091 is a deficient number, since it is larger than the sum of its proper divisors (117974309).

771888091 is a wasteful number, since it uses less digits than its factorization.

771888091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53058.

The product of its (nonzero) digits is 225792, while the sum is 49.

The square root of 771888091 is about 27782.8740593913. The cubic root of 771888091 is about 917.3141938260.

The spelling of 771888091 in words is "seven hundred seventy-one million, eight hundred eighty-eight thousand, ninety-one".