781972943 has 2 divisors, whose sum is σ = 781972944. Its totient is φ = 781972942.

The previous prime is 781972937. The next prime is 781972967. The reversal of 781972943 is 349279187.

It is a weak prime.

It is an emirp because it is prime and its reverse (349279187) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 781972943 - 2⁴ = 781972927 is a prime.

It is a super-2 number, since 2×781972943² = 1222963367168162498, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 781972891 and 781972900.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (781972993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 390986471 + 390986472.

It is an arithmetic number, because the mean of its divisors is an integer number (390986472).

Almost surely, 2^781972943 is an apocalyptic number.

781972943 is a deficient number, since it is larger than the sum of its proper divisors (1).

781972943 is an equidigital number, since it uses as much as digits as its factorization.

781972943 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 762048, while the sum is 50.

The square root of 781972943 is about 27963.7791258621. The cubic root of 781972943 is about 921.2918771862.

The spelling of 781972943 in words is "seven hundred eighty-one million, nine hundred seventy-two thousand, nine hundred forty-three".