1321541061 has 16 divisors (see below), whose sum is σ = 1873362816. Its totient is φ = 826819136.

The previous prime is 1321541041. The next prime is 1321541071. The reversal of 1321541061 is 1601451231.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1321541061 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321541021) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 177030 + ... + 184343.

It is an arithmetic number, because the mean of its divisors is an integer number (117085176).

Almost surely, 2^1321541061 is an apocalyptic number.

It is an amenable number.

1321541061 is a deficient number, since it is larger than the sum of its proper divisors (551821755).

1321541061 is a wasteful number, since it uses less digits than its factorization.

1321541061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 361452.

The product of its (nonzero) digits is 720, while the sum is 24.

The square root of 1321541061 is about 36353.0062168179. The cubic root of 1321541061 is about 1097.3880344403.

Adding to 1321541061 its reverse (1601451231), we get a palindrome (2922992292).

The spelling of 1321541061 in words is "one billion, three hundred twenty-one million, five hundred forty-one thousand, sixty-one".