1256122141 has 4 divisors (see below), whose sum is σ = 1282848192. Its totient is φ = 1229396092.

The previous prime is 1256122117. The next prime is 1256122159. The reversal of 1256122141 is 1412216521.

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.

It is a cyclic number.

It is not a de Polignac number, because 1256122141 - 2¹⁷ = 1255991069 is a prime.

It is a super-2 number, since 2×1256122141² = 3155685666220847762, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1256122111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13362955 + ... + 13363048.

It is an arithmetic number, because the mean of its divisors is an integer number (320712048).

Almost surely, 2^1256122141 is an apocalyptic number.

It is an amenable number.

1256122141 is a deficient number, since it is larger than the sum of its proper divisors (26726051).

1256122141 is an equidigital number, since it uses as much as digits as its factorization.

1256122141 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26726050.

The product of its digits is 960, while the sum is 25.

The square root of 1256122141 is about 35441.8134552960. The cubic root of 1256122141 is about 1078.9731154347.

Adding to 1256122141 its reverse (1412216521), we get a palindrome (2668338662).

The spelling of 1256122141 in words is "one billion, two hundred fifty-six million, one hundred twenty-two thousand, one hundred forty-one".