1213557 has 8 divisors (see below), whose sum is σ = 1670400. Its totient is φ = 782880.

The previous prime is 1213547. The next prime is 1213561. The reversal of 1213557 is 7553121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1213557 - 2⁸ = 1213301 is a prime.

It is a Smith number, since the sum of its digits (24) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213517) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6432 + ... + 6617.

It is an arithmetic number, because the mean of its divisors is an integer number (208800).

2^1213557 is an apocalyptic number.

It is an amenable number.

1213557 is a deficient number, since it is larger than the sum of its proper divisors (456843).

1213557 is a wasteful number, since it uses less digits than its factorization.

1213557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13083.

The product of its digits is 1050, while the sum is 24.

The square root of 1213557 is about 1101.6156316974. The cubic root of 1213557 is about 106.6645388030.

Adding to 1213557 its reverse (7553121), we get a palindrome (8766678).

It can be divided in two parts, 1213 and 557, that added together give a triangular number (1770 = T₅₉).

The spelling of 1213557 in words is "one million, two hundred thirteen thousand, five hundred fifty-seven".