921975623 has 4 divisors (see below), whose sum is σ = 923787480. Its totient is φ = 920163768.

The previous prime is 921975581. The next prime is 921975629. The reversal of 921975623 is 326579129.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 326579129 = 17 ⋅19210537.

It is a cyclic number.

It is not a de Polignac number, because 921975623 - 2⁶ = 921975559 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 (921975629) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 905165 + ... + 906182.

It is an arithmetic number, because the mean of its divisors is an integer number (230946870).

Almost surely, 2^921975623 is an apocalyptic number.

921975623 is a deficient number, since it is larger than the sum of its proper divisors (1811857).

921975623 is a wasteful number, since it uses less digits than its factorization.

921975623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1811856.

The product of its digits is 204120, while the sum is 44.

The square root of 921975623 is about 30364.0514918546. The cubic root of 921975623 is about 973.2845128476.

The spelling of 921975623 in words is "nine hundred twenty-one million, nine hundred seventy-five thousand, six hundred twenty-three".