197678081 has 4 divisors (see below), whose sum is σ = 198498564. Its totient is φ = 196857600.

The previous prime is 197678059. The next prime is 197678101. The reversal of 197678081 is 180876791.

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 177955600 + 19722481 = 13340^2 + 4441^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-197678081 is a prime.

It is a super-2 number, since 2×197678081² = 78153247415685122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (197678021) 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, 409880 + ... + 410361.

It is an arithmetic number, because the mean of its divisors is an integer number (49624641).

Almost surely, 2^197678081 is an apocalyptic number.

It is an amenable number.

197678081 is a deficient number, since it is larger than the sum of its proper divisors (820483).

197678081 is an equidigital number, since it uses as much as digits as its factorization.

197678081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 820482.

The product of its (nonzero) digits is 169344, while the sum is 47.

The square root of 197678081 is about 14059.8037326273. The cubic root of 197678081 is about 582.5316220008.

The spelling of 197678081 in words is "one hundred ninety-seven million, six hundred seventy-eight thousand, eighty-one".