256292391 has 16 divisors (see below), whose sum is σ = 362324448. Its totient is φ = 160588800.

The previous prime is 256292389. The next prime is 256292411. The reversal of 256292391 is 193292652.

It is not a de Polignac number, because 256292391 - 2¹ = 256292389 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256292371) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38811 + ... + 44931.

It is an arithmetic number, because the mean of its divisors is an integer number (22645278).

Almost surely, 2^256292391 is an apocalyptic number.

256292391 is a deficient number, since it is larger than the sum of its proper divisors (106032057).

256292391 is a wasteful number, since it uses less digits than its factorization.

256292391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6962.

The product of its digits is 58320, while the sum is 39.

The square root of 256292391 is about 16009.1346112149. The cubic root of 256292391 is about 635.2020693217.

The spelling of 256292391 in words is "two hundred fifty-six million, two hundred ninety-two thousand, three hundred ninety-one".