771886993 has 2 divisors, whose sum is σ = 771886994. Its totient is φ = 771886992.

The previous prime is 771886991. The next prime is 771887003. The reversal of 771886993 is 399688177.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 481934209 + 289952784 = 21953^2 + 17028^2 .

It is a cyclic number.

It is not a de Polignac number, because 771886993 - 2¹ = 771886991 is a prime.

Together with 771886991, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (771886991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 385943496 + 385943497.

It is an arithmetic number, because the mean of its divisors is an integer number (385943497).

Almost surely, 2^771886993 is an apocalyptic number.

It is an amenable number.

771886993 is a deficient number, since it is larger than the sum of its proper divisors (1).

771886993 is an equidigital number, since it uses as much as digits as its factorization.

771886993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4572288, while the sum is 58.

The square root of 771886993 is about 27782.8542990097. The cubic root of 771886993 is about 917.3137588703.

The spelling of 771886993 in words is "seven hundred seventy-one million, eight hundred eighty-six thousand, nine hundred ninety-three".