781464899 has 2 divisors, whose sum is σ = 781464900. Its totient is φ = 781464898.

The previous prime is 781464863. The next prime is 781464907. The reversal of 781464899 is 998464187.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-781464899 is a prime.

It is a super-2 number, since 2×781464899² = 1221374776738160402, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (781464809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 390732449 + 390732450.

It is an arithmetic number, because the mean of its divisors is an integer number (390732450).

Almost surely, 2^781464899 is an apocalyptic number.

781464899 is a deficient number, since it is larger than the sum of its proper divisors (1).

781464899 is an equidigital number, since it uses as much as digits as its factorization.

781464899 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3483648, while the sum is 56.

The square root of 781464899 is about 27954.6936846033. The cubic root of 781464899 is about 921.0923143513.

The spelling of 781464899 in words is "seven hundred eighty-one million, four hundred sixty-four thousand, eight hundred ninety-nine".