100861615 has 4 divisors (see below), whose sum is σ = 121033944. Its totient is φ = 80689288.

The previous prime is 100861613. The next prime is 100861627. The reversal of 100861615 is 516168001.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 100861615 - 2¹ = 100861613 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100861613) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10086157 + ... + 10086166.

It is an arithmetic number, because the mean of its divisors is an integer number (30258486).

Almost surely, 2^100861615 is an apocalyptic number.

100861615 is a deficient number, since it is larger than the sum of its proper divisors (20172329).

100861615 is an equidigital number, since it uses as much as digits as its factorization.

100861615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20172328.

The product of its (nonzero) digits is 1440, while the sum is 28.

The square root of 100861615 is about 10042.9883500878. The cubic root of 100861615 is about 465.4881604106.

The spelling of 100861615 in words is "one hundred million, eight hundred sixty-one thousand, six hundred fifteen".