1263661253 has 8 divisors (see below), whose sum is σ = 1361104800. Its totient is φ = 1169311248.

The previous prime is 1263661219. The next prime is 1263661261. The reversal of 1263661253 is 3521663621.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1263661253 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1263661213) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 772538 + ... + 774171.

It is an arithmetic number, because the mean of its divisors is an integer number (170138100).

Almost surely, 2^1263661253 is an apocalyptic number.

It is an amenable number.

1263661253 is a deficient number, since it is larger than the sum of its proper divisors (97443547).

1263661253 is a wasteful number, since it uses less digits than its factorization.

1263661253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1546771.

The product of its digits is 38880, while the sum is 35.

The square root of 1263661253 is about 35548.0133481465. The cubic root of 1263661253 is about 1081.1274385989.

The spelling of 1263661253 in words is "one billion, two hundred sixty-three million, six hundred sixty-one thousand, two hundred fifty-three".