100661049 has 16 divisors (see below), whose sum is σ = 150971840. Its totient is φ = 67105908.

The previous prime is 100661039. The next prime is 100661051. The reversal of 100661049 is 940166001.

100661049 is a `hidden beast` number, since 1 + 0 + 0 + 6 + 610 + 49 = 666.

It is not a de Polignac number, because 100661049 - 2⁵ = 100661017 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (100661039) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20827 + ... + 25200.

It is an arithmetic number, because the mean of its divisors is an integer number (9435740).

Almost surely, 2^100661049 is an apocalyptic number.

It is an amenable number.

100661049 is a deficient number, since it is larger than the sum of its proper divisors (50310791).

100661049 is an frugal number, since it uses more digits than its factorization.

100661049 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46048 (or 46030 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 100661049 is about 10032.9980065781. The cubic root of 100661049 is about 465.1794104780.

The spelling of 100661049 in words is "one hundred million, six hundred sixty-one thousand, forty-nine".