90649851 has 4 divisors (see below), whose sum is σ = 120866472. Its totient is φ = 60433232.

The previous prime is 90649841. The next prime is 90649883. The reversal of 90649851 is 15894609.

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

It is a cyclic number.

It is not a de Polignac number, because 90649851 - 2⁶ = 90649787 is a prime.

It is not an unprimeable number, because it can be changed into a prime (90649841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15108306 + ... + 15108311.

It is an arithmetic number, because the mean of its divisors is an integer number (30216618).

Almost surely, 2^90649851 is an apocalyptic number.

90649851 is a deficient number, since it is larger than the sum of its proper divisors (30216621).

90649851 is a wasteful number, since it uses less digits than its factorization.

90649851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30216620.

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

The square root of 90649851 is about 9521.0215313274. The cubic root of 90649851 is about 449.2164983538.

It can be divided in two parts, 9064 and 9851, that added together give a triangular number (18915 = T₁₉₄).

The spelling of 90649851 in words is "ninety million, six hundred forty-nine thousand, eight hundred fifty-one".