901090901 has 4 divisors (see below), whose sum is σ = 909357900. Its totient is φ = 892823904.

The previous prime is 901090877. The next prime is 901090937. The reversal of 901090901 is 109090109.

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 255168676 + 645922225 = 15974^2 + 25415^2 .

It is a cyclic number.

It is not a de Polignac number, because 901090901 - 2²² = 896896597 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (901090951) 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 3 ways as a sum of consecutive naturals, for example, 4133336 + ... + 4133553.

It is an arithmetic number, because the mean of its divisors is an integer number (227339475).

Almost surely, 2^901090901 is an apocalyptic number.

It is an amenable number.

901090901 is a deficient number, since it is larger than the sum of its proper divisors (8266999).

901090901 is a wasteful number, since it uses less digits than its factorization.

901090901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8266998.

The product of its (nonzero) digits is 729, while the sum is 29.

The square root of 901090901 is about 30018.1761771098. The cubic root of 901090901 is about 965.8793209270.

The spelling of 901090901 in words is "nine hundred one million, ninety thousand, nine hundred one".