103561643 has 2 divisors, whose sum is σ = 103561644. Its totient is φ = 103561642.

The previous prime is 103561621. The next prime is 103561651. The reversal of 103561643 is 346165301.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 103561643 - 2¹⁸ = 103299499 is a prime.

It is a super-3 number, since 3×103561643³ (a number of 25 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (103561693) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51780821 + 51780822.

It is an arithmetic number, because the mean of its divisors is an integer number (51780822).

Almost surely, 2^103561643 is an apocalyptic number.

103561643 is a deficient number, since it is larger than the sum of its proper divisors (1).

103561643 is an equidigital number, since it uses as much as digits as its factorization.

103561643 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6480, while the sum is 29.

The square root of 103561643 is about 10176.5241118960. The cubic root of 103561643 is about 469.6052865328.

It can be divided in two parts, 10 and 3561643, that added together give a palindrome (3561653).

The spelling of 103561643 in words is "one hundred three million, five hundred sixty-one thousand, six hundred forty-three".