781266427 has 2 divisors, whose sum is σ = 781266428. Its totient is φ = 781266426.

The previous prime is 781266419. The next prime is 781266449. The reversal of 781266427 is 724662187.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 781266427 - 2³ = 781266419 is a prime.

It is a super-2 number, since 2×781266427² = 1220754459914692658, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (781266407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 390633213 + 390633214.

It is an arithmetic number, because the mean of its divisors is an integer number (390633214).

Almost surely, 2^781266427 is an apocalyptic number.

781266427 is a deficient number, since it is larger than the sum of its proper divisors (1).

781266427 is an equidigital number, since it uses as much as digits as its factorization.

781266427 is an evil number, because the sum of its binary digits is even.

The product of its digits is 225792, while the sum is 43.

The square root of 781266427 is about 27951.1435723120. The cubic root of 781266427 is about 921.0143298240.

The spelling of 781266427 in words is "seven hundred eighty-one million, two hundred sixty-six thousand, four hundred twenty-seven".