1256262506 has 4 divisors (see below), whose sum is σ = 1884393762. Its totient is φ = 628131252.

The previous prime is 1256262493. The next prime is 1256262521. The reversal of 1256262506 is 6052626521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6052626521 = 107 ⋅56566603.

It can be written as a sum of positive squares in only one way, i.e., 1256064481 + 198025 = 35441^2 + 445^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 314065625 + ... + 314065628.

Almost surely, 2^1256262506 is an apocalyptic number.

1256262506 is a deficient number, since it is larger than the sum of its proper divisors (628131256).

1256262506 is an equidigital number, since it uses as much as digits as its factorization.

1256262506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 628131255.

The product of its (nonzero) digits is 43200, while the sum is 35.

The square root of 1256262506 is about 35443.7936175009. The cubic root of 1256262506 is about 1079.0133037825.

The spelling of 1256262506 in words is "one billion, two hundred fifty-six million, two hundred sixty-two thousand, five hundred six".