198606431 has 2 divisors, whose sum is σ = 198606432. Its totient is φ = 198606430.

The previous prime is 198606409. The next prime is 198606439. The reversal of 198606431 is 134606891.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-198606431 is a prime.

It is a super-2 number, since 2×198606431² = 78889028869115522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (198606439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99303215 + 99303216.

It is an arithmetic number, because the mean of its divisors is an integer number (99303216).

Almost surely, 2^198606431 is an apocalyptic number.

198606431 is a deficient number, since it is larger than the sum of its proper divisors (1).

198606431 is an equidigital number, since it uses as much as digits as its factorization.

198606431 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31104, while the sum is 38.

The square root of 198606431 is about 14092.7793922987. The cubic root of 198606431 is about 583.4421071353.

The spelling of 198606431 in words is "one hundred ninety-eight million, six hundred six thousand, four hundred thirty-one".