901999101 has 8 divisors (see below), whose sum is σ = 1202863680. Its totient is φ = 601233632.

The previous prime is 901999081. The next prime is 901999117. The reversal of 901999101 is 101999109.

901999101 is a nontrivial binomial coefficient, being equal to C(42474, 2).

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 901999101 - 2⁹ = 901998589 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 901999101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (901999121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1 + ... + 42473.

It is an arithmetic number, because the mean of its divisors is an integer number (150357960).

Almost surely, 2^901999101 is an apocalyptic number.

901999101 is the 42473-rd triangular number and also the 21237-th hexagonal number.

It is an amenable number.

901999101 is a deficient number, since it is larger than the sum of its proper divisors (300864579).

901999101 is a wasteful number, since it uses less digits than its factorization.

901999101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49555.

The product of its (nonzero) digits is 6561, while the sum is 39.

The square root of 901999101 is about 30033.2998686458. The cubic root of 901999101 is about 966.2037118227.

The spelling of 901999101 in words is "nine hundred one million, nine hundred ninety-nine thousand, one hundred one".