901991101 has 16 divisors (see below), whose sum is σ = 994831488. Its totient is φ = 811008000.

The previous prime is 901991099. The next prime is 901991191. The reversal of 901991101 is 101199109.

It is not a de Polignac number, because 901991101 - 2¹ = 901991099 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (901991191) 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 15 ways as a sum of consecutive naturals, for example, 425821 + ... + 427933.

It is an arithmetic number, because the mean of its divisors is an integer number (62176968).

Almost surely, 2^901991101 is an apocalyptic number.

It is an amenable number.

901991101 is a deficient number, since it is larger than the sum of its proper divisors (92840387).

901991101 is a wasteful number, since it uses less digits than its factorization.

901991101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2532.

The product of its (nonzero) digits is 729, while the sum is 31.

The square root of 901991101 is about 30033.1666828525. The cubic root of 901991101 is about 966.2008553333.

The spelling of 901991101 in words is "nine hundred one million, nine hundred ninety-one thousand, one hundred one".