197151989 has 8 divisors (see below), whose sum is σ = 200554848. Its totient is φ = 193762800.

The previous prime is 197151979. The next prime is 197152003. The reversal of 197151989 is 989151791.

197151989 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 197151989 - 2²⁴ = 180374773 is a prime.

It is a super-2 number, since 2×197151989² = 77737813533312242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (197151959) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28139 + ... + 34439.

It is an arithmetic number, because the mean of its divisors is an integer number (25069356).

Almost surely, 2^197151989 is an apocalyptic number.

It is an amenable number.

197151989 is a deficient number, since it is larger than the sum of its proper divisors (3402859).

197151989 is an equidigital number, since it uses as much as digits as its factorization.

197151989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6835.

The product of its digits is 204120, while the sum is 50.

The square root of 197151989 is about 14041.0821876378. The cubic root of 197151989 is about 582.0143879565.

The spelling of 197151989 in words is "one hundred ninety-seven million, one hundred fifty-one thousand, nine hundred eighty-nine".