1256142341 has 4 divisors (see below), whose sum is σ = 1290092172. Its totient is φ = 1222192512.

The previous prime is 1256142323. The next prime is 1256142389. The reversal of 1256142341 is 1432416521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1432416521 = 3169 ⋅452009.

It can be written as a sum of positive squares in 2 ways, for example, as 1079385316 + 176757025 = 32854^2 + 13295^2 .

It is a cyclic number.

It is not a de Polignac number, because 1256142341 - 2¹⁴ = 1256125957 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1256142311) 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, 16974860 + ... + 16974933.

It is an arithmetic number, because the mean of its divisors is an integer number (322523043).

Almost surely, 2^1256142341 is an apocalyptic number.

It is an amenable number.

1256142341 is a deficient number, since it is larger than the sum of its proper divisors (33949831).

1256142341 is an equidigital number, since it uses as much as digits as its factorization.

1256142341 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33949830.

The product of its digits is 5760, while the sum is 29.

The square root of 1256142341 is about 35442.0984282816. The cubic root of 1256142341 is about 1078.9788991451.

Adding to 1256142341 its reverse (1432416521), we get a palindrome (2688558862).

The spelling of 1256142341 in words is "one billion, two hundred fifty-six million, one hundred forty-two thousand, three hundred forty-one".