771838381 has 4 divisors (see below), whose sum is σ = 772213500. Its totient is φ = 771463264.

The previous prime is 771838367. The next prime is 771838399. The reversal of 771838381 is 183838177.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 245548900 + 526289481 = 15670^2 + 22941^2 .

It is a cyclic number.

It is not a de Polignac number, because 771838381 - 2⁷ = 771838253 is a prime.

It is a super-2 number, since 2×771838381² = 1191468972769402322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (771838321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 184456 + ... + 188593.

It is an arithmetic number, because the mean of its divisors is an integer number (193053375).

Almost surely, 2^771838381 is an apocalyptic number.

It is an amenable number.

771838381 is a deficient number, since it is larger than the sum of its proper divisors (375119).

771838381 is a wasteful number, since it uses less digits than its factorization.

771838381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 375118.

The product of its digits is 225792, while the sum is 46.

The square root of 771838381 is about 27781.9794291192. The cubic root of 771838381 is about 917.2945015640.

The spelling of 771838381 in words is "seven hundred seventy-one million, eight hundred thirty-eight thousand, three hundred eighty-one".