921068391 has 8 divisors (see below), whose sum is σ = 1270439280. Its totient is φ = 592871552.

The previous prime is 921068371. The next prime is 921068429. The reversal of 921068391 is 193860129.

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 921068391 - 2⁵ = 921068359 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (921068371) 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, 5293410 + ... + 5293583.

It is an arithmetic number, because the mean of its divisors is an integer number (158804910).

Almost surely, 2^921068391 is an apocalyptic number.

921068391 is a deficient number, since it is larger than the sum of its proper divisors (349370889).

921068391 is a wasteful number, since it uses less digits than its factorization.

921068391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10587025.

The product of its (nonzero) digits is 23328, while the sum is 39.

The square root of 921068391 is about 30349.1085701047. The cubic root of 921068391 is about 972.9651679479.

The spelling of 921068391 in words is "nine hundred twenty-one million, sixty-eight thousand, three hundred ninety-one".