197933391 has 6 divisors (see below), whose sum is σ = 285903800. Its totient is φ = 131955588.

The previous prime is 197933383. The next prime is 197933453. The reversal of 197933391 is 193339791.

It is not a de Polignac number, because 197933391 - 2³ = 197933383 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (197933321) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 10996291 + ... + 10996308.

Almost surely, 2^197933391 is an apocalyptic number.

197933391 is a deficient number, since it is larger than the sum of its proper divisors (87970409).

197933391 is a wasteful number, since it uses less digits than its factorization.

197933391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21992605 (or 21992602 counting only the distinct ones).

The product of its digits is 137781, while the sum is 45.

The square root of 197933391 is about 14068.8802326269. The cubic root of 197933391 is about 582.7823025766.

The spelling of 197933391 in words is "one hundred ninety-seven million, nine hundred thirty-three thousand, three hundred ninety-one".