1263225561 has 16 divisors (see below), whose sum is σ = 1822470720. Its totient is φ = 773680320.

The previous prime is 1263225559. The next prime is 1263225569. The reversal of 1263225561 is 1655223621.

It is not a de Polignac number, because 1263225561 - 2¹ = 1263225559 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1263225569) 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, 68526 + ... + 84983.

It is an arithmetic number, because the mean of its divisors is an integer number (113904420).

Almost surely, 2^1263225561 is an apocalyptic number.

It is an amenable number.

1263225561 is a deficient number, since it is larger than the sum of its proper divisors (559245159).

1263225561 is a wasteful number, since it uses less digits than its factorization.

1263225561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153736.

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

The square root of 1263225561 is about 35541.8846011294. The cubic root of 1263225561 is about 1081.0031719831.

The spelling of 1263225561 in words is "one billion, two hundred sixty-three million, two hundred twenty-five thousand, five hundred sixty-one".