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199664497 is a prime number
BaseRepresentation
bin10111110011010…
…10001101110001
3111220201000012101
423321222031301
5402103230442
631451300401
74643056144
oct1371521561
9456630171
10199664497
11a278398a
1256a4a701
133249a696
141c73605b
15127decb7
hexbe6a371

199664497 has 2 divisors, whose sum is σ = 199664498. Its totient is φ = 199664496.

The previous prime is 199664467. The next prime is 199664501. The reversal of 199664497 is 794466991.

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., 190688481 + 8976016 = 13809^2 + 2996^2 .

It is a cyclic number.

It is not a de Polignac number, because 199664497 - 227 = 65446769 is a prime.

It is a super-2 number, since 2×1996644972 = 79731822724526018, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (199664467) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99832248 + 99832249.

It is an arithmetic number, because the mean of its divisors is an integer number (99832249).

Almost surely, 2199664497 is an apocalyptic number.

It is an amenable number.

199664497 is a deficient number, since it is larger than the sum of its proper divisors (1).

199664497 is an equidigital number, since it uses as much as digits as its factorization.

199664497 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2939328, while the sum is 55.

The square root of 199664497 is about 14130.2688226375. The cubic root of 199664497 is about 584.4763590453.

The spelling of 199664497 in words is "one hundred ninety-nine million, six hundred sixty-four thousand, four hundred ninety-seven".