103406581 has 2 divisors, whose sum is σ = 103406582. Its totient is φ = 103406580.

The previous prime is 103406579. The next prime is 103406587. The reversal of 103406581 is 185604301.

103406581 = 7190² + 7191².

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 51710481 + 51696100 = 7191^2 + 7190^2 .

It is a cyclic number.

It is not a de Polignac number, because 103406581 - 2¹ = 103406579 is a prime.

It is a super-2 number, since 2×103406581² = 21385841988219122, which contains 22 as substring.

Together with 103406579, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (103406587) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51703290 + 51703291.

It is an arithmetic number, because the mean of its divisors is an integer number (51703291).

Almost surely, 2^103406581 is an apocalyptic number.

103406581 is the 7191-st centered square number.

It is an amenable number.

103406581 is a deficient number, since it is larger than the sum of its proper divisors (1).

103406581 is an equidigital number, since it uses as much as digits as its factorization.

103406581 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 103406581 is about 10168.9026448285. The cubic root of 103406581 is about 469.3707907410.

The spelling of 103406581 in words is "one hundred three million, four hundred six thousand, five hundred eighty-one".