44221691509 has 2 divisors, whose sum is σ = 44221691510. Its totient is φ = 44221691508.

The previous prime is 44221691489. The next prime is 44221691537. The reversal of 44221691509 is 90519612244.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 43754180625 + 467510884 = 209175^2 + 21622^2 .

It is a cyclic number.

It is not a de Polignac number, because 44221691509 - 2²³ = 44213302901 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (44221691599) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22110845754 + 22110845755.

It is an arithmetic number, because the mean of its divisors is an integer number (22110845755).

Almost surely, 2^44221691509 is an apocalyptic number.

It is an amenable number.

44221691509 is a deficient number, since it is larger than the sum of its proper divisors (1).

44221691509 is an equidigital number, since it uses as much as digits as its factorization.

44221691509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 155520, while the sum is 43.

The spelling of 44221691509 in words is "forty-four billion, two hundred twenty-one million, six hundred ninety-one thousand, five hundred nine".