102418381 has 4 divisors (see below), whose sum is σ = 110296732. Its totient is φ = 94540032.

The previous prime is 102418363. The next prime is 102418399. The reversal of 102418381 is 183814201.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 183814201 = 2741 ⋅67061.

It is an interprime number because it is at equal distance from previous prime (102418363) and next prime (102418399).

It can be written as a sum of positive squares in 2 ways, for example, as 52490025 + 49928356 = 7245^2 + 7066^2 .

It is a cyclic number.

It is not a de Polignac number, because 102418381 - 2⁹ = 102417869 is a prime.

It is a super-2 number, since 2×102418381² = 20979049533322322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102418301) 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, 3939156 + ... + 3939181.

It is an arithmetic number, because the mean of its divisors is an integer number (27574183).

Almost surely, 2^102418381 is an apocalyptic number.

It is an amenable number.

102418381 is a deficient number, since it is larger than the sum of its proper divisors (7878351).

102418381 is an equidigital number, since it uses as much as digits as its factorization.

102418381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7878350.

The product of its (nonzero) digits is 1536, while the sum is 28.

The square root of 102418381 is about 10120.1966878120. The cubic root of 102418381 is about 467.8708293404.

The spelling of 102418381 in words is "one hundred two million, four hundred eighteen thousand, three hundred eighty-one".