141661721 has 2 divisors, whose sum is σ = 141661722. Its totient is φ = 141661720.

The previous prime is 141661717. The next prime is 141661733. The reversal of 141661721 is 127166141.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 126877696 + 14784025 = 11264^2 + 3845^2 .

It is an emirp because it is prime and its reverse (127166141) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 141661721 - 2² = 141661717 is a prime.

It is not a weakly prime, because it can be changed into another prime (141661021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 70830860 + 70830861.

It is an arithmetic number, because the mean of its divisors is an integer number (70830861).

Almost surely, 2^141661721 is an apocalyptic number.

It is an amenable number.

141661721 is a deficient number, since it is larger than the sum of its proper divisors (1).

141661721 is an equidigital number, since it uses as much as digits as its factorization.

141661721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2016, while the sum is 29.

The square root of 141661721 is about 11902.1729528687. The cubic root of 141661721 is about 521.2957343413.

The spelling of 141661721 in words is "one hundred forty-one million, six hundred sixty-one thousand, seven hundred twenty-one".