1661121141 has 8 divisors (see below), whose sum is σ = 2261952384. Its totient is φ = 1083852000.

The previous prime is 1661121127. The next prime is 1661121149. The reversal of 1661121141 is 1411211661.

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

It is not a de Polignac number, because 1661121141 - 2¹¹ = 1661119093 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1661121149) 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, 5890360 + ... + 5890641.

It is an arithmetic number, because the mean of its divisors is an integer number (282744048).

Almost surely, 2^1661121141 is an apocalyptic number.

It is an amenable number.

1661121141 is a deficient number, since it is larger than the sum of its proper divisors (600831243).

1661121141 is a wasteful number, since it uses less digits than its factorization.

1661121141 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11781051.

The product of its digits is 288, while the sum is 24.

The square root of 1661121141 is about 40756.8539144032. The cubic root of 1661121141 is about 1184.3146507922.

The spelling of 1661121141 in words is "one billion, six hundred sixty-one million, one hundred twenty-one thousand, one hundred forty-one".