198201220531 has 2 divisors, whose sum is σ = 198201220532. Its totient is φ = 198201220530.

The previous prime is 198201220523. The next prime is 198201220541. The reversal of 198201220531 is 135022102891.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 198201220531 - 2³ = 198201220523 is a prime.

It is a super-2 number, since 2×198201220531² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (198201220541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99100610265 + 99100610266.

It is an arithmetic number, because the mean of its divisors is an integer number (99100610266).

Almost surely, 2^198201220531 is an apocalyptic number.

198201220531 is a deficient number, since it is larger than the sum of its proper divisors (1).

198201220531 is an equidigital number, since it uses as much as digits as its factorization.

198201220531 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8640, while the sum is 34.

The spelling of 198201220531 in words is "one hundred ninety-eight billion, two hundred one million, two hundred twenty thousand, five hundred thirty-one".