198838537 has 2 divisors, whose sum is σ = 198838538. Its totient is φ = 198838536.

The previous prime is 198838501. The next prime is 198838543. The reversal of 198838537 is 735838891.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 197796096 + 1042441 = 14064^2 + 1021^2 .

It is a cyclic number.

It is not a de Polignac number, because 198838537 - 2¹¹ = 198836489 is a prime.

It is not a weakly prime, because it can be changed into another prime (198838637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99419268 + 99419269.

It is an arithmetic number, because the mean of its divisors is an integer number (99419269).

Almost surely, 2^198838537 is an apocalyptic number.

It is an amenable number.

198838537 is a deficient number, since it is larger than the sum of its proper divisors (1).

198838537 is an equidigital number, since it uses as much as digits as its factorization.

198838537 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1451520, while the sum is 52.

The square root of 198838537 is about 14101.0119140436. The cubic root of 198838537 is about 583.6693030241.

The spelling of 198838537 in words is "one hundred ninety-eight million, eight hundred thirty-eight thousand, five hundred thirty-seven".