216430061 has 2 divisors, whose sum is σ = 216430062. Its totient is φ = 216430060.

The previous prime is 216430037. The next prime is 216430079. The reversal of 216430061 is 160034612.

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., 116229961 + 100200100 = 10781^2 + 10010^2 .

It is a cyclic number.

It is not a de Polignac number, because 216430061 - 2¹⁴ = 216413677 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216430261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108215030 + 108215031.

It is an arithmetic number, because the mean of its divisors is an integer number (108215031).

Almost surely, 2^216430061 is an apocalyptic number.

It is an amenable number.

216430061 is a deficient number, since it is larger than the sum of its proper divisors (1).

216430061 is an equidigital number, since it uses as much as digits as its factorization.

216430061 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 216430061 is about 14711.5621536260. The cubic root of 216430061 is about 600.3979406434.

Adding to 216430061 its reverse (160034612), we get a palindrome (376464673).

The spelling of 216430061 in words is "two hundred sixteen million, four hundred thirty thousand, sixty-one".