10891399 has 2 divisors, whose sum is σ = 10891400. Its totient is φ = 10891398.

The previous prime is 10891379. The next prime is 10891409. The reversal of 10891399 is 99319801.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-10891399 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10891379) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5445699 + 5445700.

It is an arithmetic number, because the mean of its divisors is an integer number (5445700).

Almost surely, 2^10891399 is an apocalyptic number.

10891399 is a deficient number, since it is larger than the sum of its proper divisors (1).

10891399 is an equidigital number, since it uses as much as digits as its factorization.

10891399 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17496, while the sum is 40.

The square root of 10891399 is about 3300.2119628897. The cubic root of 10891399 is about 221.6636887559.

The spelling of 10891399 in words is "ten million, eight hundred ninety-one thousand, three hundred ninety-nine".