216640601 has 2 divisors, whose sum is σ = 216640602. Its totient is φ = 216640600.

The previous prime is 216640577. The next prime is 216640609. The reversal of 216640601 is 106046612.

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., 208369225 + 8271376 = 14435^2 + 2876^2 .

It is a cyclic number.

It is not a de Polignac number, because 216640601 - 2²⁶ = 149531737 is a prime.

It is not a weakly prime, because it can be changed into another prime (216640609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108320300 + 108320301.

It is an arithmetic number, because the mean of its divisors is an integer number (108320301).

Almost surely, 2^216640601 is an apocalyptic number.

It is an amenable number.

216640601 is a deficient number, since it is larger than the sum of its proper divisors (1).

216640601 is an equidigital number, since it uses as much as digits as its factorization.

216640601 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 216640601 is about 14718.7160105765. The cubic root of 216640601 is about 600.5925636619.

The spelling of 216640601 in words is "two hundred sixteen million, six hundred forty thousand, six hundred one".