198508151 has 4 divisors (see below), whose sum is σ = 198546912. Its totient is φ = 198469392.

The previous prime is 198508139. The next prime is 198508153. The reversal of 198508151 is 151805891.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 198508151 - 2⁶ = 198508087 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198508153) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10271 + ... + 22416.

It is an arithmetic number, because the mean of its divisors is an integer number (49636728).

Almost surely, 2^198508151 is an apocalyptic number.

198508151 is a deficient number, since it is larger than the sum of its proper divisors (38761).

198508151 is an equidigital number, since it uses as much as digits as its factorization.

198508151 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38760.

The product of its (nonzero) digits is 14400, while the sum is 38.

The square root of 198508151 is about 14089.2920688018. The cubic root of 198508151 is about 583.3458528651.

The spelling of 198508151 in words is "one hundred ninety-eight million, five hundred eight thousand, one hundred fifty-one".