201691393 has 8 divisors (see below), whose sum is σ = 210825216. Its totient is φ = 192588000.

The previous prime is 201691379. The next prime is 201691409. The reversal of 201691393 is 393196102.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 201691393 - 2⁵ = 201691361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (201691493) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6528 + ... + 21118.

It is an arithmetic number, because the mean of its divisors is an integer number (26353152).

Almost surely, 2^201691393 is an apocalyptic number.

201691393 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

201691393 is a deficient number, since it is larger than the sum of its proper divisors (9133823).

201691393 is a wasteful number, since it uses less digits than its factorization.

201691393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15215.

The product of its (nonzero) digits is 8748, while the sum is 34.

The square root of 201691393 is about 14201.8094973845. The cubic root of 201691393 is about 586.4474764770.

The spelling of 201691393 in words is "two hundred one million, six hundred ninety-one thousand, three hundred ninety-three".