781423079 has 2 divisors, whose sum is σ = 781423080. Its totient is φ = 781423078.

The previous prime is 781423031. The next prime is 781423103. The reversal of 781423079 is 970324187.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 781423079 - 2²⁰ = 780374503 is a prime.

It is a super-2 number, since 2×781423079² = 1221244056787680482, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (781423579) 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, 390711539 + 390711540.

It is an arithmetic number, because the mean of its divisors is an integer number (390711540).

Almost surely, 2^781423079 is an apocalyptic number.

781423079 is a deficient number, since it is larger than the sum of its proper divisors (1).

781423079 is an equidigital number, since it uses as much as digits as its factorization.

781423079 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 84672, while the sum is 41.

The square root of 781423079 is about 27953.9456785621. The cubic root of 781423079 is about 921.0758833435.

The spelling of 781423079 in words is "seven hundred eighty-one million, four hundred twenty-three thousand, seventy-nine".