256131251447 has 8 divisors (see below), whose sum is σ = 257672163840. Its totient is φ = 254591722080.

The previous prime is 256131251429. The next prime is 256131251479. The reversal of 256131251447 is 744152131652.

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 256131251447 - 2⁸ = 256131251191 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 (256131241447) 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, 26954 + ... + 716232.

It is an arithmetic number, because the mean of its divisors is an integer number (32209020480).

Almost surely, 2^256131251447 is an apocalyptic number.

256131251447 is a deficient number, since it is larger than the sum of its proper divisors (1540912393).

256131251447 is a wasteful number, since it uses less digits than its factorization.

256131251447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 691513.

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

The spelling of 256131251447 in words is "two hundred fifty-six billion, one hundred thirty-one million, two hundred fifty-one thousand, four hundred forty-seven".