256287101 has 6 divisors (see below), whose sum is σ = 298129950. Its totient is φ = 219674616.

The previous prime is 256287061. The next prime is 256287107. The reversal of 256287101 is 101782652.

It can be written as a sum of positive squares in only one way, i.e., 233295076 + 22992025 = 15274^2 + 4795^2 .

It is not a de Polignac number, because 256287101 - 2⁶ = 256287037 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256287107) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2615126 + ... + 2615223.

It is an arithmetic number, because the mean of its divisors is an integer number (49688325).

Almost surely, 2^256287101 is an apocalyptic number.

It is an amenable number.

256287101 is a deficient number, since it is larger than the sum of its proper divisors (41842849).

256287101 is an equidigital number, since it uses as much as digits as its factorization.

256287101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5230363 (or 5230356 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 32.

The square root of 256287101 is about 16008.9693921876. The cubic root of 256287101 is about 635.1976989981.

The spelling of 256287101 in words is "two hundred fifty-six million, two hundred eighty-seven thousand, one hundred one".