1201041661 has 8 divisors (see below), whose sum is σ = 1280259200. Its totient is φ = 1123424640.

The previous prime is 1201041617. The next prime is 1201041689. The reversal of 1201041661 is 1661401021.

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

It is a cyclic number.

It is not a de Polignac number, because 1201041661 - 2²⁵ = 1167487229 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 (1201044661) 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, 398580 + ... + 401581.

It is an arithmetic number, because the mean of its divisors is an integer number (160032400).

Almost surely, 2^1201041661 is an apocalyptic number.

It is an amenable number.

1201041661 is a deficient number, since it is larger than the sum of its proper divisors (79217539).

1201041661 is an equidigital number, since it uses as much as digits as its factorization.

1201041661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 800259.

The product of its (nonzero) digits is 288, while the sum is 22.

The square root of 1201041661 is about 34656.0479714580. The cubic root of 1201041661 is about 1062.9659608081.

Adding to 1201041661 its reverse (1661401021), we get a palindrome (2862442682).

The spelling of 1201041661 in words is "one billion, two hundred one million, forty-one thousand, six hundred sixty-one".