1501221 has 8 divisors (see below), whose sum is σ = 2026080. Its totient is φ = 988592.

The previous prime is 1501217. The next prime is 1501223. The reversal of 1501221 is 1221051.

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

It is a cyclic number.

It is not a de Polignac number, because 1501221 - 2² = 1501217 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1501197 and 1501206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1501223) 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, 2766 + ... + 3263.

It is an arithmetic number, because the mean of its divisors is an integer number (253260).

2^1501221 is an apocalyptic number.

It is an amenable number.

1501221 is a deficient number, since it is larger than the sum of its proper divisors (524859).

1501221 is an equidigital number, since it uses as much as digits as its factorization.

1501221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6115.

The product of its (nonzero) digits is 20, while the sum is 12.

The square root of 1501221 is about 1225.2432411566. The cubic root of 1501221 is about 114.5024757447.

Adding to 1501221 its reverse (1221051), we get a palindrome (2722272).

The spelling of 1501221 in words is "one million, five hundred one thousand, two hundred twenty-one".