581961 has 8 divisors (see below), whose sum is σ = 821664. Its totient is φ = 365120.

The previous prime is 581953. The next prime is 581981. The reversal of 581961 is 169185.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 581961 - 2³ = 581953 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (581921) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5655 + ... + 5756.

It is an arithmetic number, because the mean of its divisors is an integer number (102708).

2⁵⁸¹⁹⁶¹ is an apocalyptic number.

581961 is a gapful number since it is divisible by the number (51) formed by its first and last digit.

It is an amenable number.

581961 is a deficient number, since it is larger than the sum of its proper divisors (239703).

581961 is a wasteful number, since it uses less digits than its factorization.

581961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11431.

The product of its digits is 2160, while the sum is 30.

The square root of 581961 is about 762.8636837601. The cubic root of 581961 is about 83.4893911247.

The spelling of 581961 in words is "five hundred eighty-one thousand, nine hundred sixty-one".