921173453 has 4 divisors (see below), whose sum is σ = 922455360. Its totient is φ = 919891548.

The previous prime is 921173399. The next prime is 921173459. The reversal of 921173453 is 354371129.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 354371129 = 7 ⋅50624447.

It is a cyclic number.

It is not a de Polignac number, because 921173453 - 2⁶ = 921173389 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 (921173459) 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, 639875 + ... + 641312.

It is an arithmetic number, because the mean of its divisors is an integer number (230613840).

Almost surely, 2^921173453 is an apocalyptic number.

It is an amenable number.

921173453 is a deficient number, since it is larger than the sum of its proper divisors (1281907).

921173453 is a wasteful number, since it uses less digits than its factorization.

921173453 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1281906.

The product of its digits is 22680, while the sum is 35.

The square root of 921173453 is about 30350.8394117856. The cubic root of 921173453 is about 973.0021604163.

The spelling of 921173453 in words is "nine hundred twenty-one million, one hundred seventy-three thousand, four hundred fifty-three".