581209000920 has 96 divisors (see below), whose sum is σ = 2000042759520. Its totient is φ = 145872061440.

The previous prime is 581209000907. The next prime is 581209000927. The reversal of 581209000920 is 29000902185.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (581209000927) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 47478276 + ... + 47490515.

It is an arithmetic number, because the mean of its divisors is an integer number (20833778745).

Almost surely, 2^581209000920 is an apocalyptic number.

It is an amenable number.

581209000920 is an abundant number, since it is smaller than the sum of its proper divisors (1418833758600).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

581209000920 is a wasteful number, since it uses less digits than its factorization.

581209000920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94968825 (or 94968818 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 36.

The spelling of 581209000920 in words is "five hundred eighty-one billion, two hundred nine million, nine hundred twenty", and thus it is an aban number.