197247981 has 16 divisors (see below), whose sum is σ = 306704000. Its totient is φ = 112712544.

The previous prime is 197247959. The next prime is 197247989. The reversal of 197247981 is 189742791.

It is not a de Polignac number, because 197247981 - 2⁶ = 197247917 is a prime.

It is a super-2 number, since 2×197247981² = 77813532017152722, which contains 22 as substring.

It is the 14045-th Hogben number.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 197247981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (197247989) by changing a digit.

It is a nontrivial repunit in base 14044.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 94816 + ... + 96873.

It is an arithmetic number, because the mean of its divisors is an integer number (19169000).

Almost surely, 2^197247981 is an apocalyptic number.

It is an amenable number.

197247981 is a deficient number, since it is larger than the sum of its proper divisors (109456019).

197247981 is an equidigital number, since it uses as much as digits as its factorization.

197247981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191713 (or 191699 counting only the distinct ones).

The product of its digits is 254016, while the sum is 48.

The square root of 197247981 is about 14044.5000267008. The cubic root of 197247981 is about 582.1088322826.

The spelling of 197247981 in words is "one hundred ninety-seven million, two hundred forty-seven thousand, nine hundred eighty-one".