1221513 has 8 divisors (see below), whose sum is σ = 1668576. Its totient is φ = 794400.

The previous prime is 1221503. The next prime is 1221523. The reversal of 1221513 is 3151221.

It is an interprime number because it is at equal distance from previous prime (1221503) and next prime (1221523).

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

It is not a de Polignac number, because 1221513 - 2⁶ = 1221449 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1221492 and 1221501.

It is not an unprimeable number, because it can be changed into a prime (1221503) 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, 4843 + ... + 5088.

It is an arithmetic number, because the mean of its divisors is an integer number (208572).

2^1221513 is an apocalyptic number.

It is an amenable number.

1221513 is a deficient number, since it is larger than the sum of its proper divisors (447063).

1221513 is an equidigital number, since it uses as much as digits as its factorization.

1221513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9975.

The product of its digits is 60, while the sum is 15.

The square root of 1221513 is about 1105.2207924211. The cubic root of 1221513 is about 106.8971265019.

Adding to 1221513 its reverse (3151221), we get a palindrome (4372734).

The spelling of 1221513 in words is "one million, two hundred twenty-one thousand, five hundred thirteen".