581878061 has 4 divisors (see below), whose sum is σ = 585241692. Its totient is φ = 578514432.

The previous prime is 581878051. The next prime is 581878067. The reversal of 581878061 is 160878185.

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 544288900 + 37589161 = 23330^2 + 6131^2 .

It is a cyclic number.

It is not a de Polignac number, because 581878061 - 2⁶ = 581877997 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 (581878067) 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, 1681556 + ... + 1681901.

It is an arithmetic number, because the mean of its divisors is an integer number (146310423).

Almost surely, 2^581878061 is an apocalyptic number.

It is an amenable number.

581878061 is a deficient number, since it is larger than the sum of its proper divisors (3363631).

581878061 is a wasteful number, since it uses less digits than its factorization.

581878061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3363630.

The product of its (nonzero) digits is 107520, while the sum is 44.

The square root of 581878061 is about 24122.1487641545. The cubic root of 581878061 is about 834.8542473316.

The spelling of 581878061 in words is "five hundred eighty-one million, eight hundred seventy-eight thousand, sixty-one".