1256342233 has 4 divisors (see below), whose sum is σ = 1256422708. Its totient is φ = 1256261760.

The previous prime is 1256342207. The next prime is 1256342281. The reversal of 1256342233 is 3322436521.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 532086489 + 724255744 = 23067^2 + 26912^2 .

It is a cyclic number.

It is not a de Polignac number, because 1256342233 - 2⁵ = 1256342201 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1256342195 and 1256342204.

It is not an unprimeable number, because it can be changed into a prime (1256352233) 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, 8448 + ... + 50833.

It is an arithmetic number, because the mean of its divisors is an integer number (314105677).

Almost surely, 2^1256342233 is an apocalyptic number.

It is an amenable number.

1256342233 is a deficient number, since it is larger than the sum of its proper divisors (80475).

1256342233 is an equidigital number, since it uses as much as digits as its factorization.

1256342233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80474.

The product of its digits is 25920, while the sum is 31.

The square root of 1256342233 is about 35444.9182958573. The cubic root of 1256342233 is about 1079.0361293394.

Adding to 1256342233 its reverse (3322436521), we get a palindrome (4578778754).

The spelling of 1256342233 in words is "one billion, two hundred fifty-six million, three hundred forty-two thousand, two hundred thirty-three".