1256578151 has 2 divisors, whose sum is σ = 1256578152. Its totient is φ = 1256578150.

The previous prime is 1256578133. The next prime is 1256578153. The reversal of 1256578151 is 1518756521.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1256578151 - 2¹⁴ = 1256561767 is a prime.

Together with 1256578153, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 1256578099 and 1256578108.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1256578153) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 628289075 + 628289076.

It is an arithmetic number, because the mean of its divisors is an integer number (628289076).

Almost surely, 2^1256578151 is an apocalyptic number.

1256578151 is a deficient number, since it is larger than the sum of its proper divisors (1).

1256578151 is an equidigital number, since it uses as much as digits as its factorization.

1256578151 is an evil number, because the sum of its binary digits is even.

The product of its digits is 84000, while the sum is 41.

The square root of 1256578151 is about 35448.2460920142. The cubic root of 1256578151 is about 1079.1036661687.

The spelling of 1256578151 in words is "one billion, two hundred fifty-six million, five hundred seventy-eight thousand, one hundred fifty-one".