256450553 has 2 divisors, whose sum is σ = 256450554. Its totient is φ = 256450552.

The previous prime is 256450547. The next prime is 256450591. The reversal of 256450553 is 355054652.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 134281744 + 122168809 = 11588^2 + 11053^2 .

It is a cyclic number.

It is not a de Polignac number, because 256450553 - 2⁶ = 256450489 is a prime.

It is a super-2 number, since 2×256450553² = 131533772268011618, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (256456553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128225276 + 128225277.

It is an arithmetic number, because the mean of its divisors is an integer number (128225277).

Almost surely, 2^256450553 is an apocalyptic number.

It is an amenable number.

256450553 is a deficient number, since it is larger than the sum of its proper divisors (1).

256450553 is an equidigital number, since it uses as much as digits as its factorization.

256450553 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 90000, while the sum is 35.

The square root of 256450553 is about 16014.0735916880. The cubic root of 256450553 is about 635.3327067944.

The spelling of 256450553 in words is "two hundred fifty-six million, four hundred fifty thousand, five hundred fifty-three".