100861945 has 8 divisors (see below), whose sum is σ = 122166144. Its totient is φ = 79935024.

The previous prime is 100861921. The next prime is 100861967. The reversal of 100861945 is 549168001.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 100861945 - 2¹⁵ = 100829177 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 100861945.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 93729 + ... + 94798.

It is an arithmetic number, because the mean of its divisors is an integer number (15270768).

Almost surely, 2^100861945 is an apocalyptic number.

It is an amenable number.

100861945 is a deficient number, since it is larger than the sum of its proper divisors (21304199).

100861945 is a wasteful number, since it uses less digits than its factorization.

100861945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 188639.

The product of its (nonzero) digits is 8640, while the sum is 34.

The square root of 100861945 is about 10043.0047794472. The cubic root of 100861945 is about 465.4886680729.

The spelling of 100861945 in words is "one hundred million, eight hundred sixty-one thousand, nine hundred forty-five".