102100081 has 4 divisors (see below), whose sum is σ = 105393664. Its totient is φ = 98806500.

The previous prime is 102100073. The next prime is 102100093. The reversal of 102100081 is 180001201.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 180001201 = 1531 ⋅117571.

It is a cyclic number.

It is not a de Polignac number, because 102100081 - 2³ = 102100073 is a prime.

It is a super-2 number, since 2×102100081² = 20848853080413122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (102100001) 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, 1646745 + ... + 1646806.

It is an arithmetic number, because the mean of its divisors is an integer number (26348416).

Almost surely, 2^102100081 is an apocalyptic number.

It is an amenable number.

102100081 is a deficient number, since it is larger than the sum of its proper divisors (3293583).

102100081 is an equidigital number, since it uses as much as digits as its factorization.

102100081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3293582.

The product of its (nonzero) digits is 16, while the sum is 13.

The square root of 102100081 is about 10104.4584713878. The cubic root of 102100081 is about 467.3856370436.

Adding to 102100081 its reverse (180001201), we get a palindrome (282101282).

The spelling of 102100081 in words is "one hundred two million, one hundred thousand, eighty-one".