198610537 has 2 divisors, whose sum is σ = 198610538. Its totient is φ = 198610536.

The previous prime is 198610523. The next prime is 198610619. The reversal of 198610537 is 735016891.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 185477161 + 13133376 = 13619^2 + 3624^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-198610537 is a prime.

It is a super-2 number, since 2×198610537² = 78892290814856738, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 198610537.

It is not a weakly prime, because it can be changed into another prime (198611537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99305268 + 99305269.

It is an arithmetic number, because the mean of its divisors is an integer number (99305269).

Almost surely, 2^198610537 is an apocalyptic number.

It is an amenable number.

198610537 is a deficient number, since it is larger than the sum of its proper divisors (1).

198610537 is an equidigital number, since it uses as much as digits as its factorization.

198610537 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 45360, while the sum is 40.

The square root of 198610537 is about 14092.9250689841. The cubic root of 198610537 is about 583.4461278120.

The spelling of 198610537 in words is "one hundred ninety-eight million, six hundred ten thousand, five hundred thirty-seven".