199976551 has 2 divisors, whose sum is σ = 199976552. Its totient is φ = 199976550.

The previous prime is 199976533. The next prime is 199976561. The reversal of 199976551 is 155679991.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 199976551 - 2⁵ = 199976519 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (199976561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99988275 + 99988276.

It is an arithmetic number, because the mean of its divisors is an integer number (99988276).

Almost surely, 2^199976551 is an apocalyptic number.

199976551 is a deficient number, since it is larger than the sum of its proper divisors (1).

199976551 is an equidigital number, since it uses as much as digits as its factorization.

199976551 is an evil number, because the sum of its binary digits is even.

The product of its digits is 765450, while the sum is 52.

The square root of 199976551 is about 14141.3065520835. The cubic root of 199976551 is about 584.7806916520.

The spelling of 199976551 in words is "one hundred ninety-nine million, nine hundred seventy-six thousand, five hundred fifty-one".