1541052221 has 4 divisors (see below), whose sum is σ = 1570128732. Its totient is φ = 1511975712.

The previous prime is 1541052197. The next prime is 1541052239. The reversal of 1541052221 is 1222501451.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1222501451 = 23 ⋅53152237.

It can be written as a sum of positive squares in 2 ways, for example, as 1286011321 + 255040900 = 35861^2 + 15970^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1541052221 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 (1541052241) 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, 14538176 + ... + 14538281.

It is an arithmetic number, because the mean of its divisors is an integer number (392532183).

Almost surely, 2^1541052221 is an apocalyptic number.

It is an amenable number.

1541052221 is a deficient number, since it is larger than the sum of its proper divisors (29076511).

1541052221 is an equidigital number, since it uses as much as digits as its factorization.

1541052221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29076510.

The product of its (nonzero) digits is 800, while the sum is 23.

The square root of 1541052221 is about 39256.2379883758. The cubic root of 1541052221 is about 1155.0633001920.

Adding to 1541052221 its reverse (1222501451), we get a palindrome (2763553672).

The spelling of 1541052221 in words is "one billion, five hundred forty-one million, fifty-two thousand, two hundred twenty-one".