1213559 has 4 divisors (see below), whose sum is σ = 1243200. Its totient is φ = 1183920.

The previous prime is 1213547. The next prime is 1213561. The reversal of 1213559 is 9553121.

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 1213559 - 2¹² = 1209463 is a prime.

It is an Ulam 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 (1213529) 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, 14759 + ... + 14840.

It is an arithmetic number, because the mean of its divisors is an integer number (310800).

2^1213559 is an apocalyptic number.

1213559 is a deficient number, since it is larger than the sum of its proper divisors (29641).

1213559 is an equidigital number, since it uses as much as digits as its factorization.

1213559 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29640.

The product of its digits is 1350, while the sum is 26.

The square root of 1213559 is about 1101.6165394546. The cubic root of 1213559 is about 106.6645973991.

The spelling of 1213559 in words is "one million, two hundred thirteen thousand, five hundred fifty-nine".