91000002 has 8 divisors (see below), whose sum is σ = 182000016. Its totient is φ = 30333332.

The previous prime is 90999989. The next prime is 91000009. The reversal of 91000002 is 20000019.

It is a happy number.

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

91000002 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (91000009) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7583328 + ... + 7583339.

It is an arithmetic number, because the mean of its divisors is an integer number (22750002).

Almost surely, 2^91000002 is an apocalyptic number.

91000002 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

91000002 is a wasteful number, since it uses less digits than its factorization.

91000002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15166672.

The product of its (nonzero) digits is 18, while the sum is 12.

The square root of 91000002 is about 9539.3921189979. The cubic root of 91000002 is about 449.7941478227.

The spelling of 91000002 in words is "ninety-one million, two", and thus it is an aban number and an uban number.