102101681 has 4 divisors (see below), whose sum is σ = 111383664. Its totient is φ = 92819700.

The previous prime is 102101641. The next prime is 102101723. The reversal of 102101681 is 186101201.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-102101681 is a prime.

It is a super-2 number, since 2×102101681² = 20849506526051522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (102101641) 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, 4640975 + ... + 4640996.

It is an arithmetic number, because the mean of its divisors is an integer number (27845916).

Almost surely, 2^102101681 is an apocalyptic number.

102101681 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

102101681 is a deficient number, since it is larger than the sum of its proper divisors (9281983).

102101681 is an equidigital number, since it uses as much as digits as its factorization.

102101681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9281982.

The product of its (nonzero) digits is 96, while the sum is 20.

The square root of 102101681 is about 10104.5376440488. The cubic root of 102101681 is about 467.3880784818.

Adding to 102101681 its reverse (186101201), we get a palindrome (288202882).

The spelling of 102101681 in words is "one hundred two million, one hundred one thousand, six hundred eighty-one".