198523057 has 2 divisors, whose sum is σ = 198523058. Its totient is φ = 198523056.

The previous prime is 198523049. The next prime is 198523099. The reversal of 198523057 is 750325891.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 193098816 + 5424241 = 13896^2 + 2329^2 .

It is a cyclic number.

It is not a de Polignac number, because 198523057 - 2³ = 198523049 is a prime.

It is a super-2 number, since 2×198523057² = 78822808321250498, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (198523037) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99261528 + 99261529.

It is an arithmetic number, because the mean of its divisors is an integer number (99261529).

Almost surely, 2^198523057 is an apocalyptic number.

It is an amenable number.

198523057 is a deficient number, since it is larger than the sum of its proper divisors (1).

198523057 is an equidigital number, since it uses as much as digits as its factorization.

198523057 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 75600, while the sum is 40.

The square root of 198523057 is about 14089.8210421566. The cubic root of 198523057 is about 583.3604536688.

The spelling of 198523057 in words is "one hundred ninety-eight million, five hundred twenty-three thousand, fifty-seven".