193397431 has 4 divisors (see below), whose sum is σ = 193426272. Its totient is φ = 193368592.

The previous prime is 193397429. The next prime is 193397441. The reversal of 193397431 is 134793391.

193397431 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 brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 193397431 - 2¹ = 193397429 is a prime.

It is a super-2 number, since 2×193397431² = 74805132634799522, 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 (193397441) 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, 1491 + ... + 19723.

It is an arithmetic number, because the mean of its divisors is an integer number (48356568).

Almost surely, 2^193397431 is an apocalyptic number.

193397431 is a deficient number, since it is larger than the sum of its proper divisors (28841).

193397431 is a wasteful number, since it uses less digits than its factorization.

193397431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28840.

The product of its digits is 61236, while the sum is 40.

The square root of 193397431 is about 13906.7404879792. The cubic root of 193397431 is about 578.2960602583.

The spelling of 193397431 in words is "one hundred ninety-three million, three hundred ninety-seven thousand, four hundred thirty-one".