102887891 has 2 divisors, whose sum is σ = 102887892. Its totient is φ = 102887890.

The previous prime is 102887887. The next prime is 102887933. The reversal of 102887891 is 198788201.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 102887891 - 2² = 102887887 is a prime.

It is a super-2 number, since 2×102887891² = 21171836228855762, which contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (102880891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51443945 + 51443946.

It is an arithmetic number, because the mean of its divisors is an integer number (51443946).

Almost surely, 2^102887891 is an apocalyptic number.

102887891 is a deficient number, since it is larger than the sum of its proper divisors (1).

102887891 is an equidigital number, since it uses as much as digits as its factorization.

102887891 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64512, while the sum is 44.

The square root of 102887891 is about 10143.3668473540. The cubic root of 102887891 is about 468.5846830131.

The spelling of 102887891 in words is "one hundred two million, eight hundred eighty-seven thousand, eight hundred ninety-one".