198526157 has 2 divisors, whose sum is σ = 198526158. Its totient is φ = 198526156.

The previous prime is 198526129. The next prime is 198526171. The reversal of 198526157 is 751625891.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 185123236 + 13402921 = 13606^2 + 3661^2 .

It is an emirp because it is prime and its reverse (751625891) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 198526157 - 2¹² = 198522061 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (198526057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99263078 + 99263079.

It is an arithmetic number, because the mean of its divisors is an integer number (99263079).

Almost surely, 2^198526157 is an apocalyptic number.

It is an amenable number.

198526157 is a deficient number, since it is larger than the sum of its proper divisors (1).

198526157 is an equidigital number, since it uses as much as digits as its factorization.

198526157 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 151200, while the sum is 44.

The square root of 198526157 is about 14089.9310502216. The cubic root of 198526157 is about 583.3634901053.

The spelling of 198526157 in words is "one hundred ninety-eight million, five hundred twenty-six thousand, one hundred fifty-seven".