100661089 has 9 divisors (see below), whose sum is σ = 102760497. Its totient is φ = 98604324.

The previous prime is 100661083. The next prime is 100661101. The reversal of 100661089 is 980166001.

It is a happy number.

The square root of 100661089 is 10033.

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

It is not a de Polignac number, because 100661089 - 2³ = 100661081 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 100661089.

It is not an unprimeable number, because it can be changed into a prime (100661081) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 792544 + ... + 792670.

It is an arithmetic number, because the mean of its divisors is an integer number (11417833).

Almost surely, 2^100661089 is an apocalyptic number.

100661089 is the 10033-rd square number.

100661089 is the 5017-th centered octagonal number.

It is an amenable number.

100661089 is a deficient number, since it is larger than the sum of its proper divisors (2099408).

100661089 is an frugal number, since it uses more digits than its factorization.

100661089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 412 (or 206 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 31.

The cubic root of 100661089 is about 465.1794720946.

The spelling of 100661089 in words is "one hundred million, six hundred sixty-one thousand, eighty-nine".