1541061221 has 12 divisors (see below), whose sum is σ = 1793623788. Its totient is φ = 1320201792.

The previous prime is 1541061217. The next prime is 1541061227. The reversal of 1541061221 is 1221601451.

It can be written as a sum of positive squares in 2 ways, for example, as 217120225 + 1323940996 = 14735^2 + 36386^2 .

It is not a de Polignac number, because 1541061221 - 2² = 1541061217 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1541061227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 97355 + ... + 112071.

It is an arithmetic number, because the mean of its divisors is an integer number (149468649).

Almost surely, 2^1541061221 is an apocalyptic number.

It is an amenable number.

1541061221 is a deficient number, since it is larger than the sum of its proper divisors (252562567).

1541061221 is a wasteful number, since it uses less digits than its factorization.

1541061221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16868 (or 16861 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 23.

The square root of 1541061221 is about 39256.3526196716. The cubic root of 1541061221 is about 1155.0655487745.

Adding to 1541061221 its reverse (1221601451), we get a palindrome (2762662672).

The spelling of 1541061221 in words is "one billion, five hundred forty-one million, sixty-one thousand, two hundred twenty-one".