90811219802 has 4 divisors (see below), whose sum is σ = 136216829706. Its totient is φ = 45405609900.

The previous prime is 90811219789. The next prime is 90811219897. The reversal of 90811219802 is 20891211809.

It is a happy number.

It is a Cunningham number, because it is equal to 301349²+1.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 20891211809 = 13 ⋅1607016293.

It can be written as a sum of positive squares in only one way, i.e., 90811219801 + 1 = 301349^2 + 1^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 90811219802.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22702804949 + ... + 22702804952.

Almost surely, 2^90811219802 is an apocalyptic number.

90811219802 is a deficient number, since it is larger than the sum of its proper divisors (45405609904).

90811219802 is a wasteful number, since it uses less digits than its factorization.

90811219802 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45405609903.

The product of its (nonzero) digits is 20736, while the sum is 41.

The spelling of 90811219802 in words is "ninety billion, eight hundred eleven million, two hundred nineteen thousand, eight hundred two".