198257551 has 2 divisors, whose sum is σ = 198257552. Its totient is φ = 198257550.

The previous prime is 198257497. The next prime is 198257567. The reversal of 198257551 is 155752891.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-198257551 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 198257498 and 198257507.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (198257651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99128775 + 99128776.

It is an arithmetic number, because the mean of its divisors is an integer number (99128776).

Almost surely, 2^198257551 is an apocalyptic number.

198257551 is a deficient number, since it is larger than the sum of its proper divisors (1).

198257551 is an equidigital number, since it uses as much as digits as its factorization.

198257551 is an evil number, because the sum of its binary digits is even.

The product of its digits is 126000, while the sum is 43.

The square root of 198257551 is about 14080.3959816477. The cubic root of 198257551 is about 583.1002743179.

The spelling of 198257551 in words is "one hundred ninety-eight million, two hundred fifty-seven thousand, five hundred fifty-one".