1516221 has 24 divisors (see below), whose sum is σ = 2568384. Its totient is φ = 843840.

The previous prime is 1516217. The next prime is 1516231. The reversal of 1516221 is 1226151.

It is not a de Polignac number, because 1516221 - 2² = 1516217 is a prime.

It is a super-2 number, since 2×1516221² = 4597852241682, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1516194 and 1516203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1516231) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2290 + ... + 2876.

It is an arithmetic number, because the mean of its divisors is an integer number (107016).

2^1516221 is an apocalyptic number.

It is an amenable number.

1516221 is a deficient number, since it is larger than the sum of its proper divisors (1052163).

1516221 is a wasteful number, since it uses less digits than its factorization.

1516221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 641 (or 638 counting only the distinct ones).

The product of its digits is 120, while the sum is 18.

The square root of 1516221 is about 1231.3492599584. The cubic root of 1516221 is about 114.8825770563.

The spelling of 1516221 in words is "one million, five hundred sixteen thousand, two hundred twenty-one".