256487513 has 32 divisors (see below), whose sum is σ = 289578240. Its totient is φ = 226293760.

The previous prime is 256487501. The next prime is 256487531. The reversal of 256487513 is 315784652.

256487513 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 256487513 - 2¹² = 256483417 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (256487533) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2269745 + ... + 2269857.

It is an arithmetic number, because the mean of its divisors is an integer number (9049320).

Almost surely, 2^256487513 is an apocalyptic number.

256487513 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

256487513 is a deficient number, since it is larger than the sum of its proper divisors (33090727).

256487513 is a wasteful number, since it uses less digits than its factorization.

256487513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 289.

The product of its digits is 201600, while the sum is 41.

The square root of 256487513 is about 16015.2275350680. The cubic root of 256487513 is about 635.3632269974.

The spelling of 256487513 in words is "two hundred fifty-six million, four hundred eighty-seven thousand, five hundred thirteen".