197627081 has 4 divisors (see below), whose sum is σ = 199847700. Its totient is φ = 195406464.

The previous prime is 197627041. The next prime is 197627117. The reversal of 197627081 is 180726791.

197627081 = 9940² + 9941².

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 98823481 + 98803600 = 9941^2 + 9940^2 .

It is a cyclic number.

It is not a de Polignac number, because 197627081 - 2¹⁰ = 197626057 is a prime.

It is a super-2 number, since 2×197627081² = 78112926289161122, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (197627041) 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, 1110176 + ... + 1110353.

It is an arithmetic number, because the mean of its divisors is an integer number (49961925).

Almost surely, 2^197627081 is an apocalyptic number.

197627081 is the 9941-st centered square number.

It is an amenable number.

197627081 is a deficient number, since it is larger than the sum of its proper divisors (2220619).

197627081 is an equidigital number, since it uses as much as digits as its factorization.

197627081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2220618.

The product of its (nonzero) digits is 42336, while the sum is 41.

The square root of 197627081 is about 14057.9899345532. The cubic root of 197627081 is about 582.4815209006.

The spelling of 197627081 in words is "one hundred ninety-seven million, six hundred twenty-seven thousand, eighty-one".