9912391 has 2 divisors, whose sum is σ = 9912392. Its totient is φ = 9912390.

The previous prime is 9912313. The next prime is 9912401. The reversal of 9912391 is 1932199.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 9912391 - 2¹³ = 9904199 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9912311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4956195 + 4956196.

It is an arithmetic number, because the mean of its divisors is an integer number (4956196).

Almost surely, 2^9912391 is an apocalyptic number.

9912391 is a deficient number, since it is larger than the sum of its proper divisors (1).

9912391 is an equidigital number, since it uses as much as digits as its factorization.

9912391 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4374, while the sum is 34.

The square root of 9912391 is about 3148.3949879264. The cubic root of 9912391 is about 214.8124631108.

The spelling of 9912391 in words is "nine million, nine hundred twelve thousand, three hundred ninety-one".