1255213645 has 32 divisors (see below), whose sum is σ = 1797523200. Its totient is φ = 840651840.

The previous prime is 1255213621. The next prime is 1255213657. The reversal of 1255213645 is 5463125521.

It is not a de Polignac number, because 1255213645 - 2¹⁵ = 1255180877 is a prime.

It is a super-3 number, since 3×1255213645³ (a number of 28 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a self number, because there is not a number n which added to its sum of digits gives 1255213645.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 65235 + ... + 82255.

It is an arithmetic number, because the mean of its divisors is an integer number (56172600).

Almost surely, 2^1255213645 is an apocalyptic number.

It is an amenable number.

1255213645 is a deficient number, since it is larger than the sum of its proper divisors (542309555).

1255213645 is an equidigital number, since it uses as much as digits as its factorization.

1255213645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17090 (or 17076 counting only the distinct ones).

The product of its digits is 36000, while the sum is 34.

The square root of 1255213645 is about 35428.9944113575. The cubic root of 1255213645 is about 1078.7129286412.

The spelling of 1255213645 in words is "one billion, two hundred fifty-five million, two hundred thirteen thousand, six hundred forty-five".