90191002 has 8 divisors (see below), whose sum is σ = 147585312. Its totient is φ = 40995900.

The previous prime is 90190993. The next prime is 90191029. The reversal of 90191002 is 20019109.

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

It is a Harshad number since it is a multiple of its sum of digits (22), and also a Moran number because the ratio is a prime number: 4099591 = 90191002 / (9 + 0 + 1 + 9 + 1 + 0 + 0 + 2).

It is an unprimeable number.

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, 2049774 + ... + 2049817.

It is an arithmetic number, because the mean of its divisors is an integer number (18448164).

Almost surely, 2^90191002 is an apocalyptic number.

90191002 is a deficient number, since it is larger than the sum of its proper divisors (57394310).

90191002 is a wasteful number, since it uses less digits than its factorization.

90191002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4099604.

The product of its (nonzero) digits is 162, while the sum is 22.

The square root of 90191002 is about 9496.8943344653. The cubic root of 90191002 is about 448.4572718651.

The spelling of 90191002 in words is "ninety million, one hundred ninety-one thousand, two".