1652531221 has 8 divisors (see below), whose sum is σ = 1804188384. Its totient is φ = 1501111920.

The previous prime is 1652531207. The next prime is 1652531227. The reversal of 1652531221 is 1221352561.

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

It is not a de Polignac number, because 1652531221 - 2⁷ = 1652531093 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1652531221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1652531227) 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, 44775 + ... + 72868.

It is an arithmetic number, because the mean of its divisors is an integer number (225523548).

Almost surely, 2^1652531221 is an apocalyptic number.

1652531221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1652531221 is a deficient number, since it is larger than the sum of its proper divisors (151657163).

1652531221 is a wasteful number, since it uses less digits than its factorization.

1652531221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118931.

The product of its digits is 3600, while the sum is 28.

The square root of 1652531221 is about 40651.3372596770. The cubic root of 1652531221 is about 1182.2696957128.

Adding to 1652531221 its reverse (1221352561), we get a palindrome (2873883782).

The spelling of 1652531221 in words is "one billion, six hundred fifty-two million, five hundred thirty-one thousand, two hundred twenty-one".