198878527 has 2 divisors, whose sum is σ = 198878528. Its totient is φ = 198878526.

The previous prime is 198878513. The next prime is 198878639. The reversal of 198878527 is 725878891.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 198878527 - 2⁷ = 198878399 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (198878507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99439263 + 99439264.

It is an arithmetic number, because the mean of its divisors is an integer number (99439264).

Almost surely, 2^198878527 is an apocalyptic number.

198878527 is a deficient number, since it is larger than the sum of its proper divisors (1).

198878527 is an equidigital number, since it uses as much as digits as its factorization.

198878527 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2257920, while the sum is 55.

The square root of 198878527 is about 14102.4298260973. The cubic root of 198878527 is about 583.7084291935.

The spelling of 198878527 in words is "one hundred ninety-eight million, eight hundred seventy-eight thousand, five hundred twenty-seven".