781253461 has 2 divisors, whose sum is σ = 781253462. Its totient is φ = 781253460.

The previous prime is 781253449. The next prime is 781253491. The reversal of 781253461 is 164352187.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 780084900 + 1168561 = 27930^2 + 1081^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-781253461 is a prime.

It is a super-2 number, since 2×781253461² = 1220713940648957042, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 781253461.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (781253491) 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, 390626730 + 390626731.

It is an arithmetic number, because the mean of its divisors is an integer number (390626731).

Almost surely, 2^781253461 is an apocalyptic number.

It is an amenable number.

781253461 is a deficient number, since it is larger than the sum of its proper divisors (1).

781253461 is an equidigital number, since it uses as much as digits as its factorization.

781253461 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 40320, while the sum is 37.

The square root of 781253461 is about 27950.9116309290. The cubic root of 781253461 is about 921.0092347043.

The spelling of 781253461 in words is "seven hundred eighty-one million, two hundred fifty-three thousand, four hundred sixty-one".