901921001 has 8 divisors (see below), whose sum is σ = 925525920. Its totient is φ = 878435712.

The previous prime is 901920997. The next prime is 901921003. The reversal of 901921001 is 100129109.

901921001 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 901921001 - 2² = 901920997 is a prime.

It is a super-2 number, since 2×901921001² = 1626922984089684002, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (901921003) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14531 + ... + 44888.

It is an arithmetic number, because the mean of its divisors is an integer number (115690740).

Almost surely, 2^901921001 is an apocalyptic number.

It is an amenable number.

901921001 is a deficient number, since it is larger than the sum of its proper divisors (23604919).

901921001 is a wasteful number, since it uses less digits than its factorization.

901921001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59815.

The product of its (nonzero) digits is 162, while the sum is 23.

The square root of 901921001 is about 30031.9996170751. Note that the first 3 decimals coincide. The cubic root of 901921001 is about 966.1758246227.

Adding to 901921001 its sum of digits (23), we get a square (901921024 = 30032²).

The spelling of 901921001 in words is "nine hundred one million, nine hundred twenty-one thousand, one".