256151405 has 8 divisors (see below), whose sum is σ = 307514232. Its totient is φ = 204832768.

The previous prime is 256151377. The next prime is 256151411. The reversal of 256151405 is 504151652.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 23222761 + 232928644 = 4819^2 + 15262^2 .

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 256151405 - 2¹⁸ = 255889261 is a prime.

It is a super-2 number, since 2×256151405² = 131227084566948050, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3437 + ... + 22893.

It is an arithmetic number, because the mean of its divisors is an integer number (38439279).

Almost surely, 2^256151405 is an apocalyptic number.

It is an amenable number.

256151405 is a deficient number, since it is larger than the sum of its proper divisors (51362827).

256151405 is a wasteful number, since it uses less digits than its factorization.

256151405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22095.

The product of its (nonzero) digits is 6000, while the sum is 29.

The square root of 256151405 is about 16004.7307068879. The cubic root of 256151405 is about 635.0855734387.

The spelling of 256151405 in words is "two hundred fifty-six million, one hundred fifty-one thousand, four hundred five".