256781467 has 2 divisors, whose sum is σ = 256781468. Its totient is φ = 256781466.

The previous prime is 256781461. The next prime is 256781471. The reversal of 256781467 is 764187652.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 256781467 - 2¹⁵ = 256748699 is a prime.

It is not a weakly prime, because it can be changed into another prime (256781461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128390733 + 128390734.

It is an arithmetic number, because the mean of its divisors is an integer number (128390734).

Almost surely, 2^256781467 is an apocalyptic number.

256781467 is a deficient number, since it is larger than the sum of its proper divisors (1).

256781467 is an equidigital number, since it uses as much as digits as its factorization.

256781467 is an evil number, because the sum of its binary digits is even.

The product of its digits is 564480, while the sum is 46.

The square root of 256781467 is about 16024.4022353409. The cubic root of 256781467 is about 635.6058590270.

The spelling of 256781467 in words is "two hundred fifty-six million, seven hundred eighty-one thousand, four hundred sixty-seven".