581781332 has 12 divisors (see below), whose sum is σ = 1110673536. Its totient is φ = 264446040.

The previous prime is 581781331. The next prime is 581781337. The reversal of 581781332 is 233187185.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (581781331) 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, 6611108 + ... + 6611195.

It is an arithmetic number, because the mean of its divisors is an integer number (92556128).

Almost surely, 2^581781332 is an apocalyptic number.

It is an amenable number.

581781332 is a deficient number, since it is larger than the sum of its proper divisors (528892204).

581781332 is a wasteful number, since it uses less digits than its factorization.

581781332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13222318 (or 13222316 counting only the distinct ones).

The product of its digits is 40320, while the sum is 38.

The square root of 581781332 is about 24120.1436977477. The cubic root of 581781332 is about 834.8079838633.

The spelling of 581781332 in words is "five hundred eighty-one million, seven hundred eighty-one thousand, three hundred thirty-two".