197961893 has 4 divisors (see below), whose sum is σ = 208380960. Its totient is φ = 187542828.

The previous prime is 197961887. The next prime is 197961901. The reversal of 197961893 is 398169791.

197961893 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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: 398169791 = 107 ⋅3721213.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-197961893 is a prime.

It is a super-2 number, since 2×197961893² = 78377822160286898, 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 (197961823) 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, 5209505 + ... + 5209542.

It is an arithmetic number, because the mean of its divisors is an integer number (52095240).

Almost surely, 2^197961893 is an apocalyptic number.

It is an amenable number.

197961893 is a deficient number, since it is larger than the sum of its proper divisors (10419067).

197961893 is a wasteful number, since it uses less digits than its factorization.

197961893 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10419066.

The product of its digits is 734832, while the sum is 53.

The square root of 197961893 is about 14069.8931410299. The cubic root of 197961893 is about 582.8102743839.

The spelling of 197961893 in words is "one hundred ninety-seven million, nine hundred sixty-one thousand, eight hundred ninety-three".