103981945 has 16 divisors (see below), whose sum is σ = 135345168. Its totient is φ = 76380160.

The previous prime is 103981931. The next prime is 103981949. The reversal of 103981945 is 549189301.

It can be written as a sum of positive squares in 8 ways, for example, as 23503104 + 80478841 = 4848^2 + 8971^2 .

It is a de Polignac number, because none of the positive numbers 2^k-103981945 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 103981898 and 103981907.

It is not an unprimeable number, because it can be changed into a prime (103981949) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11434 + ... + 18403.

It is an arithmetic number, because the mean of its divisors is an integer number (8459073).

Almost surely, 2^103981945 is an apocalyptic number.

It is an amenable number.

103981945 is a deficient number, since it is larger than the sum of its proper divisors (31363223).

103981945 is a wasteful number, since it uses less digits than its factorization.

103981945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29900.

The product of its (nonzero) digits is 38880, while the sum is 40.

The square root of 103981945 is about 10197.1537695575. The cubic root of 103981945 is about 470.2397222847.

The spelling of 103981945 in words is "one hundred three million, nine hundred eighty-one thousand, nine hundred forty-five".