1545091 has 4 divisors (see below), whose sum is σ = 1598400. Its totient is φ = 1491784.

The previous prime is 1545073. The next prime is 1545097. The reversal of 1545091 is 1905451.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1905451 = 431 ⋅4421.

It is a cyclic number.

It is not a de Polignac number, because 1545091 - 2⁵ = 1545059 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1545097) 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 in 3 ways as a sum of consecutive naturals, for example, 26611 + ... + 26668.

It is an arithmetic number, because the mean of its divisors is an integer number (399600).

2^1545091 is an apocalyptic number.

1545091 is a deficient number, since it is larger than the sum of its proper divisors (53309).

1545091 is an equidigital number, since it uses as much as digits as its factorization.

1545091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53308.

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

The square root of 1545091 is about 1243.0168944950. The cubic root of 1545091 is about 115.6071480596.

The spelling of 1545091 in words is "one million, five hundred forty-five thousand, ninety-one".