197588251081 has 27 divisors (see below), whose sum is σ = 221281588647. Its totient is φ = 176345610480.

The previous prime is 197588251079. The next prime is 197588251153. The reversal of 197588251081 is 180152885791.

It is a happy number.

The square root of 197588251081 is 444509.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 29229031225 + 168359219856 = 170965^2 + 410316^2 .

It is not a de Polignac number, because 197588251081 - 2¹ = 197588251079 is a prime.

It is a super-2 number, since 2×197588251081² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (197588251001) 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 in 26 ways as a sum of consecutive naturals, for example, 179136576 + ... + 179137678.

Almost surely, 2^197588251081 is an apocalyptic number.

197588251081 is the 444509-th square number.

197588251081 is the 222255-th centered octagonal number.

It is an amenable number.

197588251081 is a deficient number, since it is larger than the sum of its proper divisors (23693337566).

197588251081 is an frugal number, since it uses more digits than its factorization.

197588251081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2294 (or 1147 counting only the distinct ones).

The product of its (nonzero) digits is 1612800, while the sum is 55.

The spelling of 197588251081 in words is "one hundred ninety-seven billion, five hundred eighty-eight million, two hundred fifty-one thousand, eighty-one".