198057731 has 2 divisors, whose sum is σ = 198057732. Its totient is φ = 198057730.

The previous prime is 198057709. The next prime is 198057793. The reversal of 198057731 is 137750891.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-198057731 is a prime.

It is a super-2 number, since 2×198057731² = 78453729617736722, which contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (198057031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99028865 + 99028866.

It is an arithmetic number, because the mean of its divisors is an integer number (99028866).

Almost surely, 2^198057731 is an apocalyptic number.

198057731 is a deficient number, since it is larger than the sum of its proper divisors (1).

198057731 is an equidigital number, since it uses as much as digits as its factorization.

198057731 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 52920, while the sum is 41.

The square root of 198057731 is about 14073.2985117207. The cubic root of 198057731 is about 582.9043099227.

The spelling of 198057731 in words is "one hundred ninety-eight million, fifty-seven thousand, seven hundred thirty-one".