91821002 has 24 divisors (see below), whose sum is σ = 172545156. Its totient is φ = 36324288.

The previous prime is 91821001. The next prime is 91821011. The reversal of 91821002 is 20012819.

It can be written as a sum of positive squares in 2 ways, for example, as 91030681 + 790321 = 9541^2 + 889^2 .

It is not an unprimeable number, because it can be changed into a prime (91821001) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 34763 + ... + 37310.

Almost surely, 2^91821002 is an apocalyptic number.

91821002 is a deficient number, since it is larger than the sum of its proper divisors (80724154).

91821002 is a wasteful number, since it uses less digits than its factorization.

91821002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72102 (or 72095 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 23.

The square root of 91821002 is about 9582.3275878045. The cubic root of 91821002 is about 451.1427777568.

The spelling of 91821002 in words is "ninety-one million, eight hundred twenty-one thousand, two".