1256122441 has 4 divisors (see below), whose sum is σ = 1435568512. Its totient is φ = 1076676372.

The previous prime is 1256122429. The next prime is 1256122519. The reversal of 1256122441 is 1442216521.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1442216521 = 2731 ⋅528091.

It is a cyclic number.

It is not a de Polignac number, because 1256122441 - 2⁵ = 1256122409 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1256122421) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 89723025 + ... + 89723038.

It is an arithmetic number, because the mean of its divisors is an integer number (358892128).

Almost surely, 2^1256122441 is an apocalyptic number.

It is an amenable number.

1256122441 is a deficient number, since it is larger than the sum of its proper divisors (179446071).

1256122441 is an equidigital number, since it uses as much as digits as its factorization.

1256122441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179446070.

The product of its digits is 3840, while the sum is 28.

The square root of 1256122441 is about 35441.8176875848. The cubic root of 1256122441 is about 1078.9732013318.

Adding to 1256122441 its reverse (1442216521), we get a palindrome (2698338962).

The spelling of 1256122441 in words is "one billion, two hundred fifty-six million, one hundred twenty-two thousand, four hundred forty-one".