1256149 has 2 divisors, whose sum is σ = 1256150. Its totient is φ = 1256148.

The previous prime is 1256107. The next prime is 1256161. The reversal of 1256149 is 9416521.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 874225 + 381924 = 935^2 + 618^2 .

It is a cyclic number.

It is not a de Polignac number, because 1256149 - 2¹⁵ = 1223381 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a plaindrome in base 14.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1256449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 628074 + 628075.

It is an arithmetic number, because the mean of its divisors is an integer number (628075).

2^1256149 is an apocalyptic number.

It is an amenable number.

1256149 is a deficient number, since it is larger than the sum of its proper divisors (1).

1256149 is an equidigital number, since it uses as much as digits as its factorization.

1256149 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2160, while the sum is 28.

The square root of 1256149 is about 1120.7805315939. The cubic root of 1256149 is about 107.8980805752.

The spelling of 1256149 in words is "one million, two hundred fifty-six thousand, one hundred forty-nine".