901948021 has 4 divisors (see below), whose sum is σ = 971328652. Its totient is φ = 832567392.

The previous prime is 901948009. The next prime is 901948027. The reversal of 901948021 is 120849109.

901948021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 159112996 + 742835025 = 12614^2 + 27255^2 .

It is a cyclic number.

It is not a de Polignac number, because 901948021 - 2¹¹ = 901945973 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (901948027) 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, 34690296 + ... + 34690321.

It is an arithmetic number, because the mean of its divisors is an integer number (242832163).

Almost surely, 2^901948021 is an apocalyptic number.

It is an amenable number.

901948021 is a deficient number, since it is larger than the sum of its proper divisors (69380631).

901948021 is a wasteful number, since it uses less digits than its factorization.

901948021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69380630.

The product of its (nonzero) digits is 5184, while the sum is 34.

The square root of 901948021 is about 30032.4494672013. The cubic root of 901948021 is about 966.1854728477.

The spelling of 901948021 in words is "nine hundred one million, nine hundred forty-eight thousand, twenty-one".