103887781 has 4 divisors (see below), whose sum is σ = 103970412. Its totient is φ = 103805152.

The previous prime is 103887769. The next prime is 103887787. The reversal of 103887781 is 187788301.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 187788301 = 751 ⋅250051.

It can be written as a sum of positive squares in 2 ways, for example, as 75168900 + 28718881 = 8670^2 + 5359^2 .

It is a cyclic number.

It is not a de Polignac number, because 103887781 - 2²¹ = 101790629 is a prime.

It is a super-2 number, since 2×103887781² = 21585342082207922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (103887787) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39400 + ... + 41953.

It is an arithmetic number, because the mean of its divisors is an integer number (25992603).

Almost surely, 2^103887781 is an apocalyptic number.

It is an amenable number.

103887781 is a deficient number, since it is larger than the sum of its proper divisors (82631).

103887781 is an equidigital number, since it uses as much as digits as its factorization.

103887781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82630.

The product of its (nonzero) digits is 75264, while the sum is 43.

The square root of 103887781 is about 10192.5355530408. The cubic root of 103887781 is about 470.0977328070.

The spelling of 103887781 in words is "one hundred three million, eight hundred eighty-seven thousand, seven hundred eighty-one".