256215801 has 8 divisors (see below), whose sum is σ = 349565920. Its totient is φ = 166838112.

The previous prime is 256215797. The next prime is 256215803. The reversal of 256215801 is 108512652.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 256215801 - 2² = 256215797 is a prime.

It is not an unprimeable number, because it can be changed into a prime (256215803) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 992956 + ... + 993213.

It is an arithmetic number, because the mean of its divisors is an integer number (43695740).

Almost surely, 2^256215801 is an apocalyptic number.

It is an amenable number.

256215801 is a deficient number, since it is larger than the sum of its proper divisors (93350119).

256215801 is a wasteful number, since it uses less digits than its factorization.

256215801 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1986215.

The product of its (nonzero) digits is 4800, while the sum is 30.

The square root of 256215801 is about 16006.7423606429. The cubic root of 256215801 is about 635.1387887677.

The spelling of 256215801 in words is "two hundred fifty-six million, two hundred fifteen thousand, eight hundred one".