1652541221 has 4 divisors (see below), whose sum is σ = 1654766112. Its totient is φ = 1650316332.

The previous prime is 1652541217. The next prime is 1652541227. The reversal of 1652541221 is 1221452561.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1221452561 = 7 ⋅174493223.

It is a cyclic number.

It is not a de Polignac number, because 1652541221 - 2² = 1652541217 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1652541227) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1111331 + ... + 1112816.

It is an arithmetic number, because the mean of its divisors is an integer number (413691528).

Almost surely, 2^1652541221 is an apocalyptic number.

It is an amenable number.

1652541221 is a deficient number, since it is larger than the sum of its proper divisors (2224891).

1652541221 is an equidigital number, since it uses as much as digits as its factorization.

1652541221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2224890.

The product of its digits is 4800, while the sum is 29.

The square root of 1652541221 is about 40651.4602566747. The cubic root of 1652541221 is about 1182.2720804733.

Adding to 1652541221 its reverse (1221452561), we get a palindrome (2873993782).

The spelling of 1652541221 in words is "one billion, six hundred fifty-two million, five hundred forty-one thousand, two hundred twenty-one".