197891401 has 4 divisors (see below), whose sum is σ = 200845072. Its totient is φ = 194937732.

The previous prime is 197891303. The next prime is 197891417. The reversal of 197891401 is 104198791.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 197891401 - 2¹³ = 197883209 is a prime.

It is a super-2 number, since 2×197891401² = 78322013179485602, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (197891501) 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, 1476735 + ... + 1476868.

It is an arithmetic number, because the mean of its divisors is an integer number (50211268).

Almost surely, 2^197891401 is an apocalyptic number.

It is an amenable number.

197891401 is a deficient number, since it is larger than the sum of its proper divisors (2953671).

197891401 is an equidigital number, since it uses as much as digits as its factorization.

197891401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2953670.

The product of its (nonzero) digits is 18144, while the sum is 40.

The square root of 197891401 is about 14067.3878527607. The cubic root of 197891401 is about 582.7410887801.

The spelling of 197891401 in words is "one hundred ninety-seven million, eight hundred ninety-one thousand, four hundred one".