1000972921 has 8 divisors (see below), whose sum is σ = 1078217280. Its totient is φ = 923763792.

The previous prime is 1000972913. The next prime is 1000972993. The reversal of 1000972921 is 1292790001.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1000972921 - 2³ = 1000972913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1000972321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 100860 + ... + 110338.

It is an arithmetic number, because the mean of its divisors is an integer number (134777160).

Almost surely, 2^1000972921 is an apocalyptic number.

It is an amenable number.

1000972921 is a deficient number, since it is larger than the sum of its proper divisors (77244359).

1000972921 is an equidigital number, since it uses as much as digits as its factorization.

1000972921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17615.

The product of its (nonzero) digits is 2268, while the sum is 31.

The square root of 1000972921 is about 31638.1560935526. The cubic root of 1000972921 is about 1000.3242018818.

The spelling of 1000972921 in words is "one billion, nine hundred seventy-two thousand, nine hundred twenty-one".