921001093 has 4 divisors (see below), whose sum is σ = 926867500. Its totient is φ = 915134688.

The previous prime is 921001063. The next prime is 921001097. The reversal of 921001093 is 390100129.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 390100129 = 13627 ⋅28627.

It can be written as a sum of positive squares in 2 ways, for example, as 422014849 + 498986244 = 20543^2 + 22338^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-921001093 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 (921001097) 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, 2932968 + ... + 2933281.

It is an arithmetic number, because the mean of its divisors is an integer number (231716875).

Almost surely, 2^921001093 is an apocalyptic number.

It is an amenable number.

921001093 is a deficient number, since it is larger than the sum of its proper divisors (5866407).

921001093 is a wasteful number, since it uses less digits than its factorization.

921001093 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5866406.

The product of its (nonzero) digits is 486, while the sum is 25.

The square root of 921001093 is about 30347.9998187689. Note that the first 3 decimals coincide. The cubic root of 921001093 is about 972.9414707555.

The spelling of 921001093 in words is "nine hundred twenty-one million, one thousand, ninety-three".