90549861 has 8 divisors (see below), whose sum is σ = 124896480. Its totient is φ = 58284912.

The previous prime is 90549829. The next prime is 90549869. The reversal of 90549861 is 16894509.

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

It is not a de Polignac number, because 90549861 - 2⁵ = 90549829 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90549869) 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, 520315 + ... + 520488.

It is an arithmetic number, because the mean of its divisors is an integer number (15612060).

Almost surely, 2^90549861 is an apocalyptic number.

It is an amenable number.

90549861 is a deficient number, since it is larger than the sum of its proper divisors (34346619).

90549861 is a wasteful number, since it uses less digits than its factorization.

90549861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1040835.

The product of its (nonzero) digits is 77760, while the sum is 42.

The square root of 90549861 is about 9515.7690703379. The cubic root of 90549861 is about 449.0512703460.

It can be divided in two parts, 9054 and 9861, that added together give a triangular number (18915 = T₁₉₄).

The spelling of 90549861 in words is "ninety million, five hundred forty-nine thousand, eight hundred sixty-one".