1560991 has 4 divisors (see below), whose sum is σ = 1652832. Its totient is φ = 1469152.

The previous prime is 1560973. The next prime is 1560997. The reversal of 1560991 is 1990651.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1560991 - 2¹⁵ = 1528223 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1560997) 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, 45895 + ... + 45928.

It is an arithmetic number, because the mean of its divisors is an integer number (413208).

2^1560991 is an apocalyptic number.

1560991 is a deficient number, since it is larger than the sum of its proper divisors (91841).

1560991 is an equidigital number, since it uses as much as digits as its factorization.

1560991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91840.

The product of its (nonzero) digits is 2430, while the sum is 31.

The square root of 1560991 is about 1249.3962541964. The cubic root of 1560991 is about 116.0023533014.

The spelling of 1560991 in words is "one million, five hundred sixty thousand, nine hundred ninety-one".