1256046149 has 2 divisors, whose sum is σ = 1256046150. Its totient is φ = 1256046148.

The previous prime is 1256046133. The next prime is 1256046203. The reversal of 1256046149 is 9416406521.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1117230625 + 138815524 = 33425^2 + 11782^2 .

It is a cyclic number.

It is not a de Polignac number, because 1256046149 - 2⁴ = 1256046133 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1256046109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 628023074 + 628023075.

It is an arithmetic number, because the mean of its divisors is an integer number (628023075).

Almost surely, 2^1256046149 is an apocalyptic number.

It is an amenable number.

1256046149 is a deficient number, since it is larger than the sum of its proper divisors (1).

1256046149 is an equidigital number, since it uses as much as digits as its factorization.

1256046149 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 51840, while the sum is 38.

The square root of 1256046149 is about 35440.7413720424. The cubic root of 1256046149 is about 1078.9513566752.

The spelling of 1256046149 in words is "one billion, two hundred fifty-six million, forty-six thousand, one hundred forty-nine".