256186461 has 8 divisors (see below), whose sum is σ = 341665920. Its totient is φ = 170748992.

The previous prime is 256186433. The next prime is 256186501. The reversal of 256186461 is 164681652.

It is a happy number.

256186461 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 256186461 - 2⁵ = 256186429 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256186361) 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, 8821 + ... + 24293.

It is an arithmetic number, because the mean of its divisors is an integer number (42708240).

Almost surely, 2^256186461 is an apocalyptic number.

It is an amenable number.

256186461 is a deficient number, since it is larger than the sum of its proper divisors (85479459).

256186461 is a wasteful number, since it uses less digits than its factorization.

256186461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20995.

The product of its digits is 69120, while the sum is 39.

The square root of 256186461 is about 16005.8258456101. The cubic root of 256186461 is about 635.1145439926.

The spelling of 256186461 in words is "two hundred fifty-six million, one hundred eighty-six thousand, four hundred sixty-one".