1213545 has 16 divisors (see below), whose sum is σ = 2056320. Its totient is φ = 609024.

The previous prime is 1213529. The next prime is 1213547. The reversal of 1213545 is 5453121.

1213545 = T₂₅₀ + T₂₅₁ + ... + T₂₈₃.

It is not a de Polignac number, because 1213545 - 2⁴ = 1213529 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1213547) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2125 + ... + 2634.

It is an arithmetic number, because the mean of its divisors is an integer number (128520).

2^1213545 is an apocalyptic number.

1213545 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1213545 is a deficient number, since it is larger than the sum of its proper divisors (842775).

1213545 is a wasteful number, since it uses less digits than its factorization.

1213545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4784.

The product of its digits is 600, while the sum is 21.

The square root of 1213545 is about 1101.6101851381. The cubic root of 1213545 is about 106.6641872254.

Adding to 1213545 its reverse (5453121), we get a palindrome (6666666).

The spelling of 1213545 in words is "one million, two hundred thirteen thousand, five hundred forty-five".