256153999 has 2 divisors, whose sum is σ = 256154000. Its totient is φ = 256153998.

The previous prime is 256153979. The next prime is 256154027. The reversal of 256153999 is 999351652.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 256153999 - 2¹³ = 256145807 is a prime.

It is a super-2 number, since 2×256153999² = 131229742407384002, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256153979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128076999 + 128077000.

It is an arithmetic number, because the mean of its divisors is an integer number (128077000).

Almost surely, 2^256153999 is an apocalyptic number.

256153999 is a deficient number, since it is larger than the sum of its proper divisors (1).

256153999 is an equidigital number, since it uses as much as digits as its factorization.

256153999 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 656100, while the sum is 49.

The square root of 256153999 is about 16004.8117452221. The cubic root of 256153999 is about 635.0877172312.

The spelling of 256153999 in words is "two hundred fifty-six million, one hundred fifty-three thousand, nine hundred ninety-nine".