197145901 has 4 divisors (see below), whose sum is σ = 197435232. Its totient is φ = 196856572.

The previous prime is 197145887. The next prime is 197145931. The reversal of 197145901 is 109541791.

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, and also an emirpimes, since its reverse is a distinct semiprime: 109541791 = 41 ⋅2671751.

It is a cyclic number.

It is not a de Polignac number, because 197145901 - 2¹¹ = 197143853 is a prime.

It is a super-2 number, since 2×197145901² = 77733012562203602, 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 (197145931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 143641 + ... + 145006.

It is an arithmetic number, because the mean of its divisors is an integer number (49358808).

Almost surely, 2^197145901 is an apocalyptic number.

It is an amenable number.

197145901 is a deficient number, since it is larger than the sum of its proper divisors (289331).

197145901 is an equidigital number, since it uses as much as digits as its factorization.

197145901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 289330.

The product of its (nonzero) digits is 11340, while the sum is 37.

The square root of 197145901 is about 14040.8653935575. The cubic root of 197145901 is about 582.0083970793.

The spelling of 197145901 in words is "one hundred ninety-seven million, one hundred forty-five thousand, nine hundred one".