1256502045 has 16 divisors (see below), whose sum is σ = 2128662720. Its totient is φ = 630714624.

The previous prime is 1256502043. The next prime is 1256502073. The reversal of 1256502045 is 5402056521.

1256502045 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1256502045 - 2¹ = 1256502043 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1256502043) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2463475 + ... + 2463984.

It is an arithmetic number, because the mean of its divisors is an integer number (133041420).

Almost surely, 2^1256502045 is an apocalyptic number.

1256502045 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1256502045 is a deficient number, since it is larger than the sum of its proper divisors (872160675).

1256502045 is a wasteful number, since it uses less digits than its factorization.

1256502045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4927484.

The product of its (nonzero) digits is 12000, while the sum is 30.

The square root of 1256502045 is about 35447.1725952861. The cubic root of 1256502045 is about 1079.0818800396.

Adding to 1256502045 its reverse (5402056521), we get a palindrome (6658558566).

The spelling of 1256502045 in words is "one billion, two hundred fifty-six million, five hundred two thousand, forty-five".