1315221 has 8 divisors (see below), whose sum is σ = 1782624. Its totient is φ = 862320.

The previous prime is 1315213. The next prime is 1315229. The reversal of 1315221 is 1225131.

It is an interprime number because it is at equal distance from previous prime (1315213) and next prime (1315229).

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

It is not a de Polignac number, because 1315221 - 2³ = 1315213 is a prime.

It is an Ulam number.

1315221 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 1315221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1315229) 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, 3411 + ... + 3776.

It is an arithmetic number, because the mean of its divisors is an integer number (222828).

2^1315221 is an apocalyptic number.

It is an amenable number.

1315221 is a deficient number, since it is larger than the sum of its proper divisors (467403).

1315221 is an equidigital number, since it uses as much as digits as its factorization.

1315221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7251.

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

The square root of 1315221 is about 1146.8308506489. The cubic root of 1315221 is about 109.5635876786.

The spelling of 1315221 in words is "one million, three hundred fifteen thousand, two hundred twenty-one".