581116402 has 4 divisors (see below), whose sum is σ = 871674606. Its totient is φ = 290558200.

The previous prime is 581116381. The next prime is 581116409. The reversal of 581116402 is 204611185.

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

It can be written as a sum of positive squares in only one way, i.e., 560695041 + 20421361 = 23679^2 + 4519^2 .

It is not an unprimeable number, because it can be changed into a prime (581116409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 145279099 + ... + 145279102.

Almost surely, 2^581116402 is an apocalyptic number.

581116402 is a deficient number, since it is larger than the sum of its proper divisors (290558204).

581116402 is a wasteful number, since it uses less digits than its factorization.

581116402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 290558203.

The product of its (nonzero) digits is 1920, while the sum is 28.

The square root of 581116402 is about 24106.3560498056. The cubic root of 581116402 is about 834.4898228116.

Adding to 581116402 its reverse (204611185), we get a palindrome (785727587).

The spelling of 581116402 in words is "five hundred eighty-one million, one hundred sixteen thousand, four hundred two".