781049831 has 2 divisors, whose sum is σ = 781049832. Its totient is φ = 781049830.

The previous prime is 781049827. The next prime is 781049881. The reversal of 781049831 is 138940187.

It is a weak prime.

It is an emirp because it is prime and its reverse (138940187) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 781049831 - 2² = 781049827 is a prime.

It is a super-2 number, since 2×781049831² = 1220077677010257122, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (781049821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 390524915 + 390524916.

It is an arithmetic number, because the mean of its divisors is an integer number (390524916).

Almost surely, 2^781049831 is an apocalyptic number.

781049831 is a deficient number, since it is larger than the sum of its proper divisors (1).

781049831 is an equidigital number, since it uses as much as digits as its factorization.

781049831 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48384, while the sum is 41.

The square root of 781049831 is about 27947.2687574296. The cubic root of 781049831 is about 920.9292088584.

The spelling of 781049831 in words is "seven hundred eighty-one million, forty-nine thousand, eight hundred thirty-one".