1561264 has 10 divisors (see below), whose sum is σ = 3024980. Its totient is φ = 780624.

The previous prime is 1561247. The next prime is 1561267. The reversal of 1561264 is 4621651.

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

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48774 + ... + 48805.

It is an arithmetic number, because the mean of its divisors is an integer number (302498).

2^1561264 is an apocalyptic number.

It is an amenable number.

1561264 is a deficient number, since it is larger than the sum of its proper divisors (1463716).

1561264 is an equidigital number, since it uses as much as digits as its factorization.

1561264 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97587 (or 97581 counting only the distinct ones).

The product of its digits is 1440, while the sum is 25.

The square root of 1561264 is about 1249.5055021888. The cubic root of 1561264 is about 116.0091154153.

The spelling of 1561264 in words is "one million, five hundred sixty-one thousand, two hundred sixty-four".