199929797 has 2 divisors, whose sum is σ = 199929798. Its totient is φ = 199929796.

The previous prime is 199929773. The next prime is 199929811. The reversal of 199929797 is 797929991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 198077476 + 1852321 = 14074^2 + 1361^2 .

It is a cyclic number.

It is not a de Polignac number, because 199929797 - 2¹² = 199925701 is a prime.

It is a super-2 number, since 2×199929797² = 79943847456922418, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (199929767) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99964898 + 99964899.

It is an arithmetic number, because the mean of its divisors is an integer number (99964899).

Almost surely, 2^199929797 is an apocalyptic number.

It is an amenable number.

199929797 is a deficient number, since it is larger than the sum of its proper divisors (1).

199929797 is an equidigital number, since it uses as much as digits as its factorization.

199929797 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5786802, while the sum is 62.

The square root of 199929797 is about 14139.6533550155. The cubic root of 199929797 is about 584.7351146959.

The spelling of 199929797 in words is "one hundred ninety-nine million, nine hundred twenty-nine thousand, seven hundred ninety-seven".