1561263 has 32 divisors (see below), whose sum is σ = 2529792. Its totient is φ = 851840.

The previous prime is 1561247. The next prime is 1561267. The reversal of 1561263 is 3621651.

It is not a de Polignac number, because 1561263 - 2⁴ = 1561247 is a prime.

Its product of digits (1080) is a multiple of the sum of its prime divisors (54).

It is a nialpdrome in base 11.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1561267) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 67870 + ... + 67892.

It is an arithmetic number, because the mean of its divisors is an integer number (79056).

2^1561263 is an apocalyptic number.

1561263 is a deficient number, since it is larger than the sum of its proper divisors (968529).

1561263 is a wasteful number, since it uses less digits than its factorization.

1561263 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76 (or 54 counting only the distinct ones).

The product of its digits is 1080, while the sum is 24.

The square root of 1561263 is about 1249.5051020304. The cubic root of 1561263 is about 116.0090906471.

The spelling of 1561263 in words is "one million, five hundred sixty-one thousand, two hundred sixty-three".