780605431 has 2 divisors, whose sum is σ = 780605432. Its totient is φ = 780605430.

The previous prime is 780605429. The next prime is 780605461. The reversal of 780605431 is 134506087.

It is a weak prime.

It is an emirp because it is prime and its reverse (134506087) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 780605431 - 2¹ = 780605429 is a prime.

It is a super-2 number, since 2×780605431² = 1218689677813391522, which contains 22 as substring.

Together with 780605429, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (780605461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 390302715 + 390302716.

It is an arithmetic number, because the mean of its divisors is an integer number (390302716).

Almost surely, 2^780605431 is an apocalyptic number.

780605431 is a deficient number, since it is larger than the sum of its proper divisors (1).

780605431 is an equidigital number, since it uses as much as digits as its factorization.

780605431 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20160, while the sum is 34.

The square root of 780605431 is about 27939.3169386798. The cubic root of 780605431 is about 920.7545129689.

The spelling of 780605431 in words is "seven hundred eighty million, six hundred five thousand, four hundred thirty-one".