90991203 has 8 divisors (see below), whose sum is σ = 122523216. Its totient is φ = 60060000.

The previous prime is 90991193. The next prime is 90991213. The reversal of 90991203 is 30219909.

It is an interprime number because it is at equal distance from previous prime (90991193) and next prime (90991213).

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

It is not a de Polignac number, because 90991203 - 2²¹ = 88894051 is a prime.

It is not an unprimeable number, because it can be changed into a prime (90991213) 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, 149848 + ... + 150453.

It is an arithmetic number, because the mean of its divisors is an integer number (15315402).

Almost surely, 2^90991203 is an apocalyptic number.

90991203 is a deficient number, since it is larger than the sum of its proper divisors (31532013).

90991203 is a wasteful number, since it uses less digits than its factorization.

90991203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 300405.

The product of its (nonzero) digits is 4374, while the sum is 33.

The square root of 90991203 is about 9538.9309149401. The cubic root of 90991203 is about 449.7796501444.

The spelling of 90991203 in words is "ninety million, nine hundred ninety-one thousand, two hundred three".