146161721 has 2 divisors, whose sum is σ = 146161722. Its totient is φ = 146161720.

The previous prime is 146161669. The next prime is 146161723. The reversal of 146161721 is 127161641.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 81198121 + 64963600 = 9011^2 + 8060^2 .

It is a cyclic number.

It is not a de Polignac number, because 146161721 - 2²² = 141967417 is a prime.

It is a Sophie Germain prime.

Together with 146161723, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (146161723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 73080860 + 73080861.

It is an arithmetic number, because the mean of its divisors is an integer number (73080861).

Almost surely, 2^146161721 is an apocalyptic number.

It is an amenable number.

146161721 is a deficient number, since it is larger than the sum of its proper divisors (1).

146161721 is an equidigital number, since it uses as much as digits as its factorization.

146161721 is an odious number, because the sum of its binary digits is odd.

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

The square root of 146161721 is about 12089.7361840530. The cubic root of 146161721 is about 526.7580921149.

The spelling of 146161721 in words is "one hundred forty-six million, one hundred sixty-one thousand, seven hundred twenty-one".