198521629 has 2 divisors, whose sum is σ = 198521630. Its totient is φ = 198521628.

The previous prime is 198521627. The next prime is 198521651. The reversal of 198521629 is 926125891.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 181629529 + 16892100 = 13477^2 + 4110^2 .

It is a cyclic number.

It is not a de Polignac number, because 198521629 - 2¹ = 198521627 is a prime.

Together with 198521627, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (198521627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99260814 + 99260815.

It is an arithmetic number, because the mean of its divisors is an integer number (99260815).

Almost surely, 2^198521629 is an apocalyptic number.

It is an amenable number.

198521629 is a deficient number, since it is larger than the sum of its proper divisors (1).

198521629 is an equidigital number, since it uses as much as digits as its factorization.

198521629 is an evil number, because the sum of its binary digits is even.

The product of its digits is 77760, while the sum is 43.

The square root of 198521629 is about 14089.7703671848. The cubic root of 198521629 is about 583.3590549384.

The spelling of 198521629 in words is "one hundred ninety-eight million, five hundred twenty-one thousand, six hundred twenty-nine".