1263862561 has 8 divisors (see below), whose sum is σ = 1361553984. Its totient is φ = 1166238480.

The previous prime is 1263862553. The next prime is 1263862573. The reversal of 1263862561 is 1652683621.

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

It is a cyclic number.

It is not a de Polignac number, because 1263862561 - 2³ = 1263862553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1263862261) 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, 26250 + ... + 56716.

It is an arithmetic number, because the mean of its divisors is an integer number (170194248).

Almost surely, 2^1263862561 is an apocalyptic number.

It is an amenable number.

1263862561 is a deficient number, since it is larger than the sum of its proper divisors (97691423).

1263862561 is a wasteful number, since it uses less digits than its factorization.

1263862561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33671.

The product of its digits is 103680, while the sum is 40.

The square root of 1263862561 is about 35550.8447297670. The cubic root of 1263862561 is about 1081.1848453461.

The spelling of 1263862561 in words is "one billion, two hundred sixty-three million, eight hundred sixty-two thousand, five hundred sixty-one".