201219917 has 2 divisors, whose sum is σ = 201219918. Its totient is φ = 201219916.

The previous prime is 201219869. The next prime is 201220043. The reversal of 201219917 is 719912102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 160630276 + 40589641 = 12674^2 + 6371^2 .

It is a cyclic number.

It is not a de Polignac number, because 201219917 - 2¹⁴ = 201203533 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201212917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100609958 + 100609959.

It is an arithmetic number, because the mean of its divisors is an integer number (100609959).

Almost surely, 2^201219917 is an apocalyptic number.

It is an amenable number.

201219917 is a deficient number, since it is larger than the sum of its proper divisors (1).

201219917 is an equidigital number, since it uses as much as digits as its factorization.

201219917 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2268, while the sum is 32.

The square root of 201219917 is about 14185.2006330542. The cubic root of 201219917 is about 585.9901579418.

The spelling of 201219917 in words is "two hundred one million, two hundred nineteen thousand, nine hundred seventeen".