298605991 has 2 divisors, whose sum is σ = 298605992. Its totient is φ = 298605990.

The previous prime is 298605977. The next prime is 298605997. The reversal of 298605991 is 199506892.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 298605991 - 2⁵ = 298605959 is a prime.

It is a super-2 number, since 2×298605991² = 178331075722184162, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (298605997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 149302995 + 149302996.

It is an arithmetic number, because the mean of its divisors is an integer number (149302996).

Almost surely, 2^298605991 is an apocalyptic number.

298605991 is a deficient number, since it is larger than the sum of its proper divisors (1).

298605991 is an equidigital number, since it uses as much as digits as its factorization.

298605991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 349920, while the sum is 49.

The square root of 298605991 is about 17280.2196455948. The cubic root of 298605991 is about 668.3944559424.

Subtracting from 298605991 its reverse (199506892), we obtain a palindrome (99099099).

The spelling of 298605991 in words is "two hundred ninety-eight million, six hundred five thousand, nine hundred ninety-one".