197625581 has 2 divisors, whose sum is σ = 197625582. Its totient is φ = 197625580.

The previous prime is 197625559. The next prime is 197625619. The reversal of 197625581 is 185526791.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 192376900 + 5248681 = 13870^2 + 2291^2 .

It is an emirp because it is prime and its reverse (185526791) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 197625581 - 2²⁶ = 130516717 is a prime.

It is a super-2 number, since 2×197625581² = 78111740531175122, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (197625521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98812790 + 98812791.

It is an arithmetic number, because the mean of its divisors is an integer number (98812791).

Almost surely, 2^197625581 is an apocalyptic number.

It is an amenable number.

197625581 is a deficient number, since it is larger than the sum of its proper divisors (1).

197625581 is an equidigital number, since it uses as much as digits as its factorization.

197625581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 151200, while the sum is 44.

The square root of 197625581 is about 14057.9365840083. The cubic root of 197625581 is about 582.4800472084.

The spelling of 197625581 in words is "one hundred ninety-seven million, six hundred twenty-five thousand, five hundred eighty-one".