199109557 has 2 divisors, whose sum is σ = 199109558. Its totient is φ = 199109556.

The previous prime is 199109549. The next prime is 199109567. The reversal of 199109557 is 755901991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 198979236 + 130321 = 14106^2 + 361^2 .

It is a cyclic number.

It is not a de Polignac number, because 199109557 - 2³ = 199109549 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (199109527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99554778 + 99554779.

It is an arithmetic number, because the mean of its divisors is an integer number (99554779).

Almost surely, 2^199109557 is an apocalyptic number.

It is an amenable number.

199109557 is a deficient number, since it is larger than the sum of its proper divisors (1).

199109557 is an equidigital number, since it uses as much as digits as its factorization.

199109557 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 127575, while the sum is 46.

The square root of 199109557 is about 14110.6185902674. The cubic root of 199109557 is about 583.9343660601.

The spelling of 199109557 in words is "one hundred ninety-nine million, one hundred nine thousand, five hundred fifty-seven".