90581761 has 4 divisors (see below), whose sum is σ = 93705300. Its totient is φ = 87458224.

The previous prime is 90581753. The next prime is 90581773. The reversal of 90581761 is 16718509.

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 68161536 + 22420225 = 8256^2 + 4735^2 .

It is a cyclic number.

It is not a de Polignac number, because 90581761 - 2³ = 90581753 is a prime.

It is a super-2 number, since 2×90581761² = 16410110851722242, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 90581761.

It is not an unprimeable number, because it can be changed into a prime (90581741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1561726 + ... + 1561783.

It is an arithmetic number, because the mean of its divisors is an integer number (23426325).

Almost surely, 2^90581761 is an apocalyptic number.

It is an amenable number.

90581761 is a deficient number, since it is larger than the sum of its proper divisors (3123539).

90581761 is a wasteful number, since it uses less digits than its factorization.

90581761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3123538.

The product of its (nonzero) digits is 15120, while the sum is 37.

The square root of 90581761 is about 9517.4450878374. The cubic root of 90581761 is about 449.1039965587.

The spelling of 90581761 in words is "ninety million, five hundred eighty-one thousand, seven hundred sixty-one".