1256361015 has 32 divisors (see below), whose sum is σ = 2474067456. Its totient is φ = 530156160.

The previous prime is 1256360983. The next prime is 1256361023. The reversal of 1256361015 is 5101636521.

It is not a de Polignac number, because 1256361015 - 2⁵ = 1256360983 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 458841 + ... + 461570.

It is an arithmetic number, because the mean of its divisors is an integer number (77314608).

Almost surely, 2^1256361015 is an apocalyptic number.

1256361015 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1256361015 is a deficient number, since it is larger than the sum of its proper divisors (1217706441).

1256361015 is a wasteful number, since it uses less digits than its factorization.

1256361015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 920439.

The product of its (nonzero) digits is 5400, while the sum is 30.

The square root of 1256361015 is about 35445.1832411683. The cubic root of 1256361015 is about 1079.0415064187.

Adding to 1256361015 its reverse (5101636521), we get a palindrome (6357997536).

The spelling of 1256361015 in words is "one billion, two hundred fifty-six million, three hundred sixty-one thousand, fifteen".