901921 has 4 divisors (see below), whose sum is σ = 905392. Its totient is φ = 898452.

The previous prime is 901919. The next prime is 901931. The reversal of 901921 is 129109.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 901921 - 2¹ = 901919 is a prime.

It is a super-2 number, since 2×901921² = 1626922980482, which contains 22 as substring.

It is a Duffinian number.

901921 is a lucky number.

It is a plaindrome in base 11.

It is a nialpdrome in base 16.

It is a junction number, because it is equal to n+sod(n) for n = 901892 and 901901.

It is not an unprimeable number, because it can be changed into a prime (901931) 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, 1311 + ... + 1876.

It is an arithmetic number, because the mean of its divisors is an integer number (226348).

2⁹⁰¹⁹²¹ is an apocalyptic number.

It is an amenable number.

901921 is a deficient number, since it is larger than the sum of its proper divisors (3471).

901921 is a wasteful number, since it uses less digits than its factorization.

901921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3470.

The product of its (nonzero) digits is 162, while the sum is 22.

The square root of 901921 is about 949.6952142661. The cubic root of 901921 is about 96.6175824266.

The spelling of 901921 in words is "nine hundred one thousand, nine hundred twenty-one".