781342931 has 2 divisors, whose sum is σ = 781342932. Its totient is φ = 781342930.

The previous prime is 781342927. The next prime is 781342957. The reversal of 781342931 is 139243187.

781342931 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 781342931 - 2² = 781342927 is a prime.

It is a super-2 number, since 2×781342931² = 1220993551647341522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (781342531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 390671465 + 390671466.

It is an arithmetic number, because the mean of its divisors is an integer number (390671466).

Almost surely, 2^781342931 is an apocalyptic number.

781342931 is a deficient number, since it is larger than the sum of its proper divisors (1).

781342931 is an equidigital number, since it uses as much as digits as its factorization.

781342931 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 36288, while the sum is 38.

The square root of 781342931 is about 27952.5120695797. The cubic root of 781342931 is about 921.0443916902.

The spelling of 781342931 in words is "seven hundred eighty-one million, three hundred forty-two thousand, nine hundred thirty-one".