1131545 has 16 divisors (see below), whose sum is σ = 1467840. Its totient is φ = 834624.

The previous prime is 1131523. The next prime is 1131547. The reversal of 1131545 is 5451311.

1131545 = T₈₀ + T₈₁ + ... + T₁₉₃.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1131545 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1131547) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3947 + ... + 4223.

It is an arithmetic number, because the mean of its divisors is an integer number (91740).

2^1131545 is an apocalyptic number.

It is an amenable number.

1131545 is a deficient number, since it is larger than the sum of its proper divisors (336295).

1131545 is a wasteful number, since it uses less digits than its factorization.

1131545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 344.

The product of its digits is 300, while the sum is 20.

The square root of 1131545 is about 1063.7410399153. The cubic root of 1131545 is about 104.2054923713.

Adding to 1131545 its reverse (5451311), we get a palindrome (6582856).

The spelling of 1131545 in words is "one million, one hundred thirty-one thousand, five hundred forty-five".