901001001 has 4 divisors (see below), whose sum is σ = 1201334672. Its totient is φ = 600667332.

The previous prime is 901000999. The next prime is 901001027. The reversal of 901001001 is 100100109.

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 not a de Polignac number, because 901001001 - 2¹ = 901000999 is a prime.

It is a super-3 number, since 3×901001001³ (a number of 28 digits) contains 333 as substring.

It is a Duffinian number.

901001001 is a modest number, since divided by 1001 gives 901 as remainder.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (901001041) 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, 150166831 + ... + 150166836.

It is an arithmetic number, because the mean of its divisors is an integer number (300333668).

Almost surely, 2^901001001 is an apocalyptic number.

It is an amenable number.

901001001 is a deficient number, since it is larger than the sum of its proper divisors (300333671).

901001001 is a wasteful number, since it uses less digits than its factorization.

901001001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 300333670.

The product of its (nonzero) digits is 9, while the sum is 12.

The square root of 901001001 is about 30016.6787136752. The cubic root of 901001001 is about 965.8471985893.

The spelling of 901001001 in words is "nine hundred one million, one thousand, one".