1201666141 has 4 divisors (see below), whose sum is σ = 1294102012. Its totient is φ = 1109230272.

The previous prime is 1201666139. The next prime is 1201666183. The reversal of 1201666141 is 1416661021.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 692216100 + 509450041 = 26310^2 + 22571^2 .

It is a cyclic number.

It is not a de Polignac number, because 1201666141 - 2¹ = 1201666139 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 (1201666541) 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, 46217916 + ... + 46217941.

It is an arithmetic number, because the mean of its divisors is an integer number (323525503).

Almost surely, 2^1201666141 is an apocalyptic number.

It is an amenable number.

1201666141 is a deficient number, since it is larger than the sum of its proper divisors (92435871).

1201666141 is an equidigital number, since it uses as much as digits as its factorization.

1201666141 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92435870.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 1201666141 is about 34665.0564834388. The cubic root of 1201666141 is about 1063.1501581290.

The spelling of 1201666141 in words is "one billion, two hundred one million, six hundred sixty-six thousand, one hundred forty-one".