780631 has 2 divisors, whose sum is σ = 780632. Its totient is φ = 780630.

The previous prime is 780613. The next prime is 780649. The reversal of 780631 is 136087.

Together with previous prime (780613) it forms an Ormiston pair, because they use the same digits, order apart.

It is a balanced prime because it is at equal distance from previous prime (780613) and next prime (780649).

It is a cyclic number.

It is not a de Polignac number, because 780631 - 2⁹ = 780119 is a prime.

It is a super-2 number, since 2×780631² = 1218769516322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 780596 and 780605.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (780601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 390315 + 390316.

It is an arithmetic number, because the mean of its divisors is an integer number (390316).

2⁷⁸⁰⁶³¹ is an apocalyptic number.

780631 is a deficient number, since it is larger than the sum of its proper divisors (1).

780631 is an equidigital number, since it uses as much as digits as its factorization.

780631 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1008, while the sum is 25.

The square root of 780631 is about 883.5332478181. The cubic root of 780631 is about 92.0764566070.

The spelling of 780631 in words is "seven hundred eighty thousand, six hundred thirty-one".