198913531 has 2 divisors, whose sum is σ = 198913532. Its totient is φ = 198913530.

The previous prime is 198913511. The next prime is 198913573. The reversal of 198913531 is 135319891.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 198913531 - 2¹³ = 198905339 is a prime.

It is a super-2 number, since 2×198913531² = 79133185629775922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (198913501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99456765 + 99456766.

It is an arithmetic number, because the mean of its divisors is an integer number (99456766).

Almost surely, 2^198913531 is an apocalyptic number.

198913531 is a deficient number, since it is larger than the sum of its proper divisors (1).

198913531 is an equidigital number, since it uses as much as digits as its factorization.

198913531 is an evil number, because the sum of its binary digits is even.

The product of its digits is 29160, while the sum is 40.

The square root of 198913531 is about 14103.6708342190. The cubic root of 198913531 is about 583.7426727618.

The spelling of 198913531 in words is "one hundred ninety-eight million, nine hundred thirteen thousand, five hundred thirty-one".