921393453 has 4 divisors (see below), whose sum is σ = 1228524608. Its totient is φ = 614262300.

The previous prime is 921393433. The next prime is 921393457. The reversal of 921393453 is 354393129.

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: 354393129 = 3 ⋅118131043.

It is not a de Polignac number, because 921393453 - 2²⁶ = 854284589 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 (921393457) 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, 153565573 + ... + 153565578.

It is an arithmetic number, because the mean of its divisors is an integer number (307131152).

Almost surely, 2^921393453 is an apocalyptic number.

It is an amenable number.

921393453 is a deficient number, since it is larger than the sum of its proper divisors (307131155).

921393453 is a wasteful number, since it uses less digits than its factorization.

921393453 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 307131154.

The product of its digits is 87480, while the sum is 39.

The square root of 921393453 is about 30354.4634773866. The cubic root of 921393453 is about 973.0796135951.

The spelling of 921393453 in words is "nine hundred twenty-one million, three hundred ninety-three thousand, four hundred fifty-three".