256493701 has 4 divisors (see below), whose sum is σ = 256641772. Its totient is φ = 256345632.

The previous prime is 256493693. The next prime is 256493707. The reversal of 256493701 is 107394652.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 127103076 + 129390625 = 11274^2 + 11375^2 .

It is a cyclic number.

It is not a de Polignac number, because 256493701 - 2³ = 256493693 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256493707) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 71406 + ... + 74911.

It is an arithmetic number, because the mean of its divisors is an integer number (64160443).

Almost surely, 2^256493701 is an apocalyptic number.

It is an amenable number.

256493701 is a deficient number, since it is larger than the sum of its proper divisors (148071).

256493701 is a wasteful number, since it uses less digits than its factorization.

256493701 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148070.

The product of its (nonzero) digits is 45360, while the sum is 37.

The square root of 256493701 is about 16015.4207250387. The cubic root of 256493701 is about 635.3683365327.

The spelling of 256493701 in words is "two hundred fifty-six million, four hundred ninety-three thousand, seven hundred one".