1091545 has 16 divisors (see below), whose sum is σ = 1612800. Its totient is φ = 690624.

The previous prime is 1091527. The next prime is 1091549. The reversal of 1091545 is 5451901.

It is a cyclic number.

It is not a de Polignac number, because 1091545 - 2⁹ = 1091033 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1091549) 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 15 ways as a sum of consecutive naturals, for example, 745 + ... + 1654.

It is an arithmetic number, because the mean of its divisors is an integer number (100800).

2^1091545 is an apocalyptic number.

It is an amenable number.

1091545 is a deficient number, since it is larger than the sum of its proper divisors (521255).

1091545 is a wasteful number, since it uses less digits than its factorization.

1091545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2424.

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

The square root of 1091545 is about 1044.7703096853. The cubic root of 1091545 is about 102.9628483223.

It can be divided in two parts, 1091 and 545, that multiplied together give a triangular number (594595 = T₁₀₉₀).

The spelling of 1091545 in words is "one million, ninety-one thousand, five hundred forty-five".