61103643 has 4 divisors (see below), whose sum is σ = 81471528. Its totient is φ = 40735760.

The previous prime is 61103641. The next prime is 61103657. The reversal of 61103643 is 34630116.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 61103643 - 2¹ = 61103641 is a prime.

It is not an unprimeable number, because it can be changed into a prime (61103641) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10183938 + ... + 10183943.

It is an arithmetic number, because the mean of its divisors is an integer number (20367882).

Almost surely, 2^61103643 is an apocalyptic number.

61103643 is a deficient number, since it is larger than the sum of its proper divisors (20367885).

61103643 is a wasteful number, since it uses less digits than its factorization.

61103643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20367884.

The product of its (nonzero) digits is 1296, while the sum is 24.

The square root of 61103643 is about 7816.8819231200. The cubic root of 61103643 is about 393.8725377244.

Adding to 61103643 its reverse (34630116), we get a palindrome (95733759).

The spelling of 61103643 in words is "sixty-one million, one hundred three thousand, six hundred forty-three".