256361501 has 4 divisors (see below), whose sum is σ = 279667104. Its totient is φ = 233055900.

The previous prime is 256361461. The next prime is 256361507. The reversal of 256361501 is 105163652.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 256361501 - 2⁶ = 256361437 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 (256361507) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11652785 + ... + 11652806.

It is an arithmetic number, because the mean of its divisors is an integer number (69916776).

Almost surely, 2^256361501 is an apocalyptic number.

It is an amenable number.

256361501 is a deficient number, since it is larger than the sum of its proper divisors (23305603).

256361501 is a wasteful number, since it uses less digits than its factorization.

256361501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23305602.

The product of its (nonzero) digits is 5400, while the sum is 29.

The square root of 256361501 is about 16011.2929209355. The cubic root of 256361501 is about 635.2591588951.

The spelling of 256361501 in words is "two hundred fifty-six million, three hundred sixty-one thousand, five hundred one".