90218013 has 8 divisors (see below), whose sum is σ = 121415328. Its totient is φ = 59583024.

The previous prime is 90217993. The next prime is 90218033. The reversal of 90218013 is 31081209.

It is an interprime number because it is at equal distance from previous prime (90217993) and next prime (90218033).

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

It is not a de Polignac number, because 90218013 - 2⁶ = 90217949 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90218033) 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 in 7 ways as a sum of consecutive naturals, for example, 140206 + ... + 140847.

It is an arithmetic number, because the mean of its divisors is an integer number (15176916).

Almost surely, 2^90218013 is an apocalyptic number.

It is an amenable number.

90218013 is a deficient number, since it is larger than the sum of its proper divisors (31197315).

90218013 is a wasteful number, since it uses less digits than its factorization.

90218013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 281163.

The product of its (nonzero) digits is 432, while the sum is 24.

The square root of 90218013 is about 9498.3163244861. The cubic root of 90218013 is about 448.5020363836.

It can be divided in two parts, 902 and 18013, that added together give a triangular number (18915 = T₁₉₄).

The spelling of 90218013 in words is "ninety million, two hundred eighteen thousand, thirteen".