901081231999 has 4 divisors (see below), whose sum is σ = 970395172936. Its totient is φ = 831767291064.

The previous prime is 901081231991. The next prime is 901081232011. The reversal of 901081231999 is 999132180109.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 901081231999 - 2³ = 901081231991 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 (901081231991) 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, 34656970449 + ... + 34656970474.

It is an arithmetic number, because the mean of its divisors is an integer number (242598793234).

Almost surely, 2^901081231999 is an apocalyptic number.

901081231999 is a deficient number, since it is larger than the sum of its proper divisors (69313940937).

901081231999 is a wasteful number, since it uses less digits than its factorization.

901081231999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69313940936.

The product of its (nonzero) digits is 314928, while the sum is 52.

The spelling of 901081231999 in words is "nine hundred one billion, eighty-one million, two hundred thirty-one thousand, nine hundred ninety-nine".