1261564 has 12 divisors (see below), whose sum is σ = 2224600. Its totient is φ = 625968.

The previous prime is 1261549. The next prime is 1261567. The reversal of 1261564 is 4651621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1261567) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 579 + ... + 1690.

2^1261564 is an apocalyptic number.

It is an amenable number.

1261564 is a deficient number, since it is larger than the sum of its proper divisors (963036).

1261564 is a wasteful number, since it uses less digits than its factorization.

1261564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2412 (or 2410 counting only the distinct ones).

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

The square root of 1261564 is about 1123.1936609508. The cubic root of 1261564 is about 108.0529004673.

The spelling of 1261564 in words is "one million, two hundred sixty-one thousand, five hundred sixty-four".