901001992901 has 4 divisors (see below), whose sum is σ = 901006439904. Its totient is φ = 900997545900.

The previous prime is 901001992811. The next prime is 901001992907. The reversal of 901001992901 is 109299100109.

It is a happy number.

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 a cyclic number.

It is not a de Polignac number, because 901001992901 - 2³⁰ = 899928251077 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 (901001992907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1904315 + ... + 2329896.

It is an arithmetic number, because the mean of its divisors is an integer number (225251609976).

Almost surely, 2^901001992901 is an apocalyptic number.

It is an amenable number.

901001992901 is a deficient number, since it is larger than the sum of its proper divisors (4447003).

901001992901 is a wasteful number, since it uses less digits than its factorization.

901001992901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4447002.

The product of its (nonzero) digits is 13122, while the sum is 41.

The spelling of 901001992901 in words is "nine hundred one billion, one million, nine hundred ninety-two thousand, nine hundred one".