61943609 has 16 divisors (see below), whose sum is σ = 77495040. Its totient is φ = 48202560.

The previous prime is 61943599. The next prime is 61943617. The reversal of 61943609 is 90634916.

It is not a de Polignac number, because 61943609 - 2²⁴ = 45166393 is a prime.

It is a Curzon number.

It is a plaindrome in base 15.

It is a nialpdrome in base 13.

It is not an unprimeable number, because it can be changed into a prime (61943659) 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, 29 + ... + 11130.

It is an arithmetic number, because the mean of its divisors is an integer number (4843440).

Almost surely, 2^61943609 is an apocalyptic number.

It is an amenable number.

61943609 is a deficient number, since it is larger than the sum of its proper divisors (15551431).

61943609 is a wasteful number, since it uses less digits than its factorization.

61943609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11240.

The product of its (nonzero) digits is 34992, while the sum is 38.

The square root of 61943609 is about 7870.4262273399. The cubic root of 61943609 is about 395.6691302336.

The spelling of 61943609 in words is "sixty-one million, nine hundred forty-three thousand, six hundred nine".