91102210202 has 4 divisors (see below), whose sum is σ = 136653315306. Its totient is φ = 45551105100.

The previous prime is 91102210201. The next prime is 91102210217. The reversal of 91102210202 is 20201220119.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 63821411641 + 27280798561 = 252629^2 + 165169^2 .

It is a super-2 number, since 2×91102210202² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (91102210201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22775552549 + ... + 22775552552.

Almost surely, 2^91102210202 is an apocalyptic number.

91102210202 is a deficient number, since it is larger than the sum of its proper divisors (45551105104).

91102210202 is a wasteful number, since it uses less digits than its factorization.

91102210202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45551105103.

The product of its (nonzero) digits is 144, while the sum is 20.

The spelling of 91102210202 in words is "ninety-one billion, one hundred two million, two hundred ten thousand, two hundred two".