916742581 has 2 divisors, whose sum is σ = 916742582. Its totient is φ = 916742580.

The previous prime is 916742573. The next prime is 916742591. The reversal of 916742581 is 185247619.

916742581 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 903303025 + 13439556 = 30055^2 + 3666^2 .

It is an emirp because it is prime and its reverse (185247619) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 916742581 - 2³ = 916742573 is a prime.

It is a super-2 number, since 2×916742581² = 1680833919637083122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (916742521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 458371290 + 458371291.

It is an arithmetic number, because the mean of its divisors is an integer number (458371291).

Almost surely, 2^916742581 is an apocalyptic number.

It is an amenable number.

916742581 is a deficient number, since it is larger than the sum of its proper divisors (1).

916742581 is an equidigital number, since it uses as much as digits as its factorization.

916742581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 120960, while the sum is 43.

The square root of 916742581 is about 30277.7571989736. The cubic root of 916742581 is about 971.4395958575.

The spelling of 916742581 in words is "nine hundred sixteen million, seven hundred forty-two thousand, five hundred eighty-one".