920372921 has 4 divisors (see below), whose sum is σ = 991170852. Its totient is φ = 849574992.

The previous prime is 920372917. The next prime is 920372923. The reversal of 920372921 is 129273029.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 551310400 + 369062521 = 23480^2 + 19211^2 .

It is a cyclic number.

It is not a de Polignac number, because 920372921 - 2² = 920372917 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (920372923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35398946 + ... + 35398971.

It is an arithmetic number, because the mean of its divisors is an integer number (247792713).

Almost surely, 2^920372921 is an apocalyptic number.

It is an amenable number.

920372921 is a deficient number, since it is larger than the sum of its proper divisors (70797931).

920372921 is a wasteful number, since it uses less digits than its factorization.

920372921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70797930.

The product of its (nonzero) digits is 13608, while the sum is 35.

The square root of 920372921 is about 30337.6485740078. The cubic root of 920372921 is about 972.7202210747.

The spelling of 920372921 in words is "nine hundred twenty million, three hundred seventy-two thousand, nine hundred twenty-one".