1161565 has 8 divisors (see below), whose sum is σ = 1467360. Its totient is φ = 880272.

The previous prime is 1161553. The next prime is 1161581. The reversal of 1161565 is 5651611.

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 1161565 - 2⁷ = 1161437 is a prime.

It is an Ulam number.

It is a plaindrome in base 14.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6019 + ... + 6208.

It is an arithmetic number, because the mean of its divisors is an integer number (183420).

2^1161565 is an apocalyptic number.

It is an amenable number.

1161565 is a deficient number, since it is larger than the sum of its proper divisors (305795).

1161565 is a wasteful number, since it uses less digits than its factorization.

1161565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12251.

The product of its digits is 900, while the sum is 25.

The square root of 1161565 is about 1077.7592495544. The cubic root of 1161565 is about 105.1189883137.

It can be divided in two parts, 116 and 1565, that added together give a square (1681 = 41²).

The spelling of 1161565 in words is "one million, one hundred sixty-one thousand, five hundred sixty-five".