1256361045 has 16 divisors (see below), whose sum is σ = 2044249920. Its totient is φ = 658701824.

The previous prime is 1256361031. The next prime is 1256361049. The reversal of 1256361045 is 5401636521.

It is a cyclic number.

It is not a de Polignac number, because 1256361045 - 2¹² = 1256356949 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1256360997 and 1256361015.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1256361049) 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, 708924 + ... + 710693.

It is an arithmetic number, because the mean of its divisors is an integer number (127765620).

Almost surely, 2^1256361045 is an apocalyptic number.

1256361045 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1256361045 is a deficient number, since it is larger than the sum of its proper divisors (787888875).

1256361045 is a wasteful number, since it uses less digits than its factorization.

1256361045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1419684.

The product of its (nonzero) digits is 21600, while the sum is 33.

The square root of 1256361045 is about 35445.1836643570. The cubic root of 1256361045 is about 1079.0415150073.

Adding to 1256361045 its reverse (5401636521), we get a palindrome (6657997566).

The spelling of 1256361045 in words is "one billion, two hundred fifty-six million, three hundred sixty-one thousand, forty-five".