1004256391 has 2 divisors, whose sum is σ = 1004256392. Its totient is φ = 1004256390.

The previous prime is 1004256307. The next prime is 1004256397. The reversal of 1004256391 is 1936524001.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1004256391 - 2¹¹ = 1004254343 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1004256397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 502128195 + 502128196.

It is an arithmetic number, because the mean of its divisors is an integer number (502128196).

Almost surely, 2^1004256391 is an apocalyptic number.

1004256391 is a deficient number, since it is larger than the sum of its proper divisors (1).

1004256391 is an equidigital number, since it uses as much as digits as its factorization.

1004256391 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 1004256391 is about 31690.0045913534. The cubic root of 1004256391 is about 1001.4167887616.

The spelling of 1004256391 in words is "one billion, four million, two hundred fifty-six thousand, three hundred ninety-one".