198631157 has 4 divisors (see below), whose sum is σ = 198941676. Its totient is φ = 198320640.

The previous prime is 198631127. The next prime is 198631159. The reversal of 198631157 is 751136891.

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

It can be written as a sum of positive squares in 2 ways, for example, as 124567921 + 74063236 = 11161^2 + 8606^2 .

It is a cyclic number.

It is not a de Polignac number, because 198631157 - 2⁶ = 198631093 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 (198631159) 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, 154298 + ... + 155579.

It is an arithmetic number, because the mean of its divisors is an integer number (49735419).

Almost surely, 2^198631157 is an apocalyptic number.

It is an amenable number.

198631157 is a deficient number, since it is larger than the sum of its proper divisors (310519).

198631157 is an equidigital number, since it uses as much as digits as its factorization.

198631157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 310518.

The product of its digits is 45360, while the sum is 41.

The square root of 198631157 is about 14093.6566227505. The cubic root of 198631157 is about 583.4663184877.

The spelling of 198631157 in words is "one hundred ninety-eight million, six hundred thirty-one thousand, one hundred fifty-seven".