781412923 has 2 divisors, whose sum is σ = 781412924. Its totient is φ = 781412922.

The previous prime is 781412921. The next prime is 781412927. The reversal of 781412923 is 329214187.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 781412923 - 2¹ = 781412921 is a prime.

It is a super-2 number, since 2×781412923² = 1221212312462807858, which contains 22 as substring.

Together with 781412921, it forms a pair of twin primes.

It is an alternating number because its digits alternate between odd and even.

It is not a weakly prime, because it can be changed into another prime (781412921) 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 as a sum of consecutive naturals, namely, 390706461 + 390706462.

It is an arithmetic number, because the mean of its divisors is an integer number (390706462).

Almost surely, 2^781412923 is an apocalyptic number.

781412923 is a deficient number, since it is larger than the sum of its proper divisors (1).

781412923 is an equidigital number, since it uses as much as digits as its factorization.

781412923 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 24192, while the sum is 37.

The square root of 781412923 is about 27953.7640220418. The cubic root of 781412923 is about 921.0718929796.

The spelling of 781412923 in words is "seven hundred eighty-one million, four hundred twelve thousand, nine hundred twenty-three".