1256142323 has 2 divisors, whose sum is σ = 1256142324. Its totient is φ = 1256142322.

The previous prime is 1256142319. The next prime is 1256142389. The reversal of 1256142323 is 3232416521.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1256142323 - 2² = 1256142319 is a prime.

It is not a weakly prime, because it can be changed into another prime (1256142313) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 628071161 + 628071162.

It is an arithmetic number, because the mean of its divisors is an integer number (628071162).

Almost surely, 2^1256142323 is an apocalyptic number.

1256142323 is a deficient number, since it is larger than the sum of its proper divisors (1).

1256142323 is an equidigital number, since it uses as much as digits as its factorization.

1256142323 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8640, while the sum is 29.

The square root of 1256142323 is about 35442.0981743463. The cubic root of 1256142323 is about 1078.9788939913.

Adding to 1256142323 its reverse (3232416521), we get a palindrome (4488558844).

The spelling of 1256142323 in words is "one billion, two hundred fifty-six million, one hundred forty-two thousand, three hundred twenty-three".