102418861 has 4 divisors (see below), whose sum is σ = 104916924. Its totient is φ = 99920800.

The previous prime is 102418837. The next prime is 102418879. The reversal of 102418861 is 168814201.

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

It can be written as a sum of positive squares in 2 ways, for example, as 28355625 + 74063236 = 5325^2 + 8606^2 .

It is a cyclic number.

It is not a de Polignac number, because 102418861 - 2¹⁵ = 102386093 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102478861) 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, 1248970 + ... + 1249051.

It is an arithmetic number, because the mean of its divisors is an integer number (26229231).

Almost surely, 2^102418861 is an apocalyptic number.

It is an amenable number.

102418861 is a deficient number, since it is larger than the sum of its proper divisors (2498063).

102418861 is an equidigital number, since it uses as much as digits as its factorization.

102418861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2498062.

The product of its (nonzero) digits is 3072, while the sum is 31.

The square root of 102418861 is about 10120.2204027383. The cubic root of 102418861 is about 467.8715602562.

The spelling of 102418861 in words is "one hundred two million, four hundred eighteen thousand, eight hundred sixty-one".