193564397 has 12 divisors (see below), whose sum is σ = 221441556. Its totient is φ = 168161280.

The previous prime is 193564387. The next prime is 193564417. The reversal of 193564397 is 793465391.

It can be written as a sum of positive squares in 6 ways, for example, as 15768841 + 177795556 = 3971^2 + 13334^2 .

It is not a de Polignac number, because 193564397 - 2¹⁶ = 193498861 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 (193564387) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 22004 + ... + 29517.

It is an arithmetic number, because the mean of its divisors is an integer number (18453463).

Almost surely, 2^193564397 is an apocalyptic number.

193564397 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

193564397 is a deficient number, since it is larger than the sum of its proper divisors (27877159).

193564397 is a wasteful number, since it uses less digits than its factorization.

193564397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51568 (or 51551 counting only the distinct ones).

The product of its digits is 612360, while the sum is 47.

The square root of 193564397 is about 13912.7422530571. The cubic root of 193564397 is about 578.4624326972.

The spelling of 193564397 in words is "one hundred ninety-three million, five hundred sixty-four thousand, three hundred ninety-seven".