160721933 has 2 divisors, whose sum is σ = 160721934. Its totient is φ = 160721932.

The previous prime is 160721923. The next prime is 160721941. The reversal of 160721933 is 339127061.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 136936804 + 23785129 = 11702^2 + 4877^2 .

It is a cyclic number.

It is not a de Polignac number, because 160721933 - 2²⁰ = 159673357 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 160721933.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (160721923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80360966 + 80360967.

It is an arithmetic number, because the mean of its divisors is an integer number (80360967).

Almost surely, 2^160721933 is an apocalyptic number.

It is an amenable number.

160721933 is a deficient number, since it is larger than the sum of its proper divisors (1).

160721933 is an equidigital number, since it uses as much as digits as its factorization.

160721933 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6804, while the sum is 32.

The square root of 160721933 is about 12677.6154303560. The cubic root of 160721933 is about 543.6988098549.

Adding to 160721933 its reverse (339127061), we get a palindrome (499848994).

The spelling of 160721933 in words is "one hundred sixty million, seven hundred twenty-one thousand, nine hundred thirty-three".