1256233505 has 4 divisors (see below), whose sum is σ = 1507480212. Its totient is φ = 1004986800.

The previous prime is 1256233499. The next prime is 1256233541. The reversal of 1256233505 is 5053326521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5053326521 = 743 ⋅6801247.

It can be written as a sum of positive squares in 2 ways, for example, as 500148496 + 756085009 = 22364^2 + 27497^2 .

It is not a de Polignac number, because 1256233505 - 2⁶ = 1256233441 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 125623346 + ... + 125623355.

It is an arithmetic number, because the mean of its divisors is an integer number (376870053).

Almost surely, 2^1256233505 is an apocalyptic number.

It is an amenable number.

1256233505 is a deficient number, since it is larger than the sum of its proper divisors (251246707).

1256233505 is an equidigital number, since it uses as much as digits as its factorization.

1256233505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 251246706.

The product of its (nonzero) digits is 27000, while the sum is 32.

The square root of 1256233505 is about 35443.3845026120. The cubic root of 1256233505 is about 1079.0050006597.

The spelling of 1256233505 in words is "one billion, two hundred fifty-six million, two hundred thirty-three thousand, five hundred five".