1256013363 has 64 divisors (see below), whose sum is σ = 1988444160. Its totient is φ = 699148800.

The previous prime is 1256013361. The next prime is 1256013377. The reversal of 1256013363 is 3633106521.

It is a happy number.

It is not a de Polignac number, because 1256013363 - 2¹ = 1256013361 is a prime.

It is a hoax number, since the sum of its digits (30) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 1256013363.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1256013361) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 9889806 + ... + 9889932.

It is an arithmetic number, because the mean of its divisors is an integer number (31069440).

Almost surely, 2^1256013363 is an apocalyptic number.

1256013363 is a deficient number, since it is larger than the sum of its proper divisors (732430797).

1256013363 is a wasteful number, since it uses less digits than its factorization.

1256013363 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 253 (or 219 counting only the distinct ones).

The product of its (nonzero) digits is 9720, while the sum is 30.

The square root of 1256013363 is about 35440.2788222666. The cubic root of 1256013363 is about 1078.9419688018.

Adding to 1256013363 its reverse (3633106521), we get a palindrome (4889119884).

The spelling of 1256013363 in words is "one billion, two hundred fifty-six million, thirteen thousand, three hundred sixty-three".