91020202 has 16 divisors (see below), whose sum is σ = 168037632. Its totient is φ = 36007920.

The previous prime is 91020199. The next prime is 91020217. The reversal of 91020202 is 20202019.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 249874 + ... + 250237.

It is an arithmetic number, because the mean of its divisors is an integer number (10502352).

Almost surely, 2^91020202 is an apocalyptic number.

91020202 is a deficient number, since it is larger than the sum of its proper divisors (77017430).

91020202 is a wasteful number, since it uses less digits than its factorization.

91020202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 500133.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 91020202 is about 9540.4508279221. The cubic root of 91020202 is about 449.8274268315.

It can be divided in two parts, 910 and 20202, that added together give a palindrome (21112).

The spelling of 91020202 in words is "ninety-one million, twenty thousand, two hundred two".