921140506 has 16 divisors (see below), whose sum is σ = 1623269088. Its totient is φ = 386492400.

The previous prime is 921140497. The next prime is 921140513. The reversal of 921140506 is 605041129.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 1610100 + ... + 1610671.

It is an arithmetic number, because the mean of its divisors is an integer number (101454318).

Almost surely, 2^921140506 is an apocalyptic number.

921140506 is a deficient number, since it is larger than the sum of its proper divisors (702128582).

921140506 is a wasteful number, since it uses less digits than its factorization.

921140506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3220797.

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 921140506 is about 30350.2966377596. The cubic root of 921140506 is about 972.9905600370.

The spelling of 921140506 in words is "nine hundred twenty-one million, one hundred forty thousand, five hundred six".