44139561 has 4 divisors (see below), whose sum is σ = 58852752. Its totient is φ = 29426372.

The previous prime is 44139551. The next prime is 44139581. The reversal of 44139561 is 16593144.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 44139561 - 2¹³ = 44131369 is a prime.

It is not an unprimeable number, because it can be changed into a prime (44139541) 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, 7356591 + ... + 7356596.

It is an arithmetic number, because the mean of its divisors is an integer number (14713188).

Almost surely, 2^44139561 is an apocalyptic number.

It is an amenable number.

44139561 is a deficient number, since it is larger than the sum of its proper divisors (14713191).

44139561 is a wasteful number, since it uses less digits than its factorization.

44139561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14713190.

The product of its digits is 12960, while the sum is 33.

The square root of 44139561 is about 6643.7610583163. The cubic root of 44139561 is about 353.4076963653.

The spelling of 44139561 in words is "forty-four million, one hundred thirty-nine thousand, five hundred sixty-one".