778945131 has 6 divisors (see below), whose sum is σ = 1125142980. Its totient is φ = 519296748.

The previous prime is 778945093. The next prime is 778945157. The reversal of 778945131 is 131549877.

It is not a de Polignac number, because 778945131 - 2⁷ = 778945003 is a prime.

It is a super-2 number, since 2×778945131² = 1213511034217214322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (778925131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 43274721 + ... + 43274738.

It is an arithmetic number, because the mean of its divisors is an integer number (187523830).

Almost surely, 2^778945131 is an apocalyptic number.

778945131 is a deficient number, since it is larger than the sum of its proper divisors (346197849).

778945131 is a wasteful number, since it uses less digits than its factorization.

778945131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86549465 (or 86549462 counting only the distinct ones).

The product of its digits is 211680, while the sum is 45.

The square root of 778945131 is about 27909.5885136274. The cubic root of 778945131 is about 920.1012534274.

The spelling of 778945131 in words is "seven hundred seventy-eight million, nine hundred forty-five thousand, one hundred thirty-one".