1255851845 has 4 divisors (see below), whose sum is σ = 1507022220. Its totient is φ = 1004681472.

The previous prime is 1255851833. The next prime is 1255851847. The reversal of 1255851845 is 5481585521.

It is a Cunningham number, because it is equal to 35438²+1.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 452072644 + 803779201 = 21262^2 + 28351^2 .

It is a cyclic number.

It is not a de Polignac number, because 1255851845 - 2⁶ = 1255851781 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1255851796 and 1255851805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1255851847) 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, 125585180 + ... + 125585189.

It is an arithmetic number, because the mean of its divisors is an integer number (376755555).

Almost surely, 2^1255851845 is an apocalyptic number.

It is an amenable number.

1255851845 is a deficient number, since it is larger than the sum of its proper divisors (251170375).

1255851845 is an equidigital number, since it uses as much as digits as its factorization.

1255851845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 251170374.

The product of its digits is 320000, while the sum is 44.

The square root of 1255851845 is about 35438.0000141091. Note that the first 4 decimals coincide. The cubic root of 1255851845 is about 1078.8957176963.

The spelling of 1255851845 in words is "one billion, two hundred fifty-five million, eight hundred fifty-one thousand, eight hundred forty-five".