44161921 has 4 divisors (see below), whose sum is σ = 44179200. Its totient is φ = 44144644.

The previous prime is 44161919. The next prime is 44161927. The reversal of 44161921 is 12916144.

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 44161921 - 2¹ = 44161919 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 44161921.

It is not an unprimeable number, because it can be changed into a prime (44161927) 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, 3961 + ... + 10198.

It is an arithmetic number, because the mean of its divisors is an integer number (11044800).

Almost surely, 2^44161921 is an apocalyptic number.

It is an amenable number.

44161921 is a deficient number, since it is larger than the sum of its proper divisors (17279).

44161921 is a wasteful number, since it uses less digits than its factorization.

44161921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17278.

The product of its digits is 1728, while the sum is 28.

The square root of 44161921 is about 6645.4436270275. The cubic root of 44161921 is about 353.4673621310.

The spelling of 44161921 in words is "forty-four million, one hundred sixty-one thousand, nine hundred twenty-one".