256515151 has 2 divisors, whose sum is σ = 256515152. Its totient is φ = 256515150.

The previous prime is 256515097. The next prime is 256515157. The reversal of 256515151 is 151515652.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 256515151 - 2¹³ = 256506959 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256515157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128257575 + 128257576.

It is an arithmetic number, because the mean of its divisors is an integer number (128257576).

Almost surely, 2^256515151 is an apocalyptic number.

256515151 is a deficient number, since it is larger than the sum of its proper divisors (1).

256515151 is an equidigital number, since it uses as much as digits as its factorization.

256515151 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7500, while the sum is 31.

The square root of 256515151 is about 16016.0903781166. The cubic root of 256515151 is about 635.3860475212.

The spelling of 256515151 in words is "two hundred fifty-six million, five hundred fifteen thousand, one hundred fifty-one".