88861821409 has 9 divisors (see below), whose sum is σ = 89244125841. Its totient is φ = 88481151540.

The previous prime is 88861821401. The next prime is 88861821421. The reversal of 88861821409 is 90412816888.

The square root of 88861821409 is 298097.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 88861821409 - 2³ = 88861821401 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 88861821409.

It is not an unprimeable number, because it can be changed into a prime (88861821401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 91515294 + ... + 91516264.

Almost surely, 2^88861821409 is an apocalyptic number.

88861821409 is the 298097-th square number.

88861821409 is the 149049-th centered octagonal number.

It is an amenable number.

88861821409 is a deficient number, since it is larger than the sum of its proper divisors (382304432).

88861821409 is an frugal number, since it uses more digits than its factorization.

88861821409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2556 (or 1278 counting only the distinct ones).

The product of its (nonzero) digits is 1769472, while the sum is 55.

The spelling of 88861821409 in words is "eighty-eight billion, eight hundred sixty-one million, eight hundred twenty-one thousand, four hundred nine".