43981194749 has 2 divisors, whose sum is σ = 43981194750. Its totient is φ = 43981194748.

The previous prime is 43981194731. The next prime is 43981194787. The reversal of 43981194749 is 94749118934.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 42196554724 + 1784640025 = 205418^2 + 42245^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-43981194749 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43981194799) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21990597374 + 21990597375.

It is an arithmetic number, because the mean of its divisors is an integer number (21990597375).

Almost surely, 2^43981194749 is an apocalyptic number.

It is an amenable number.

43981194749 is a deficient number, since it is larger than the sum of its proper divisors (1).

43981194749 is an equidigital number, since it uses as much as digits as its factorization.

43981194749 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7838208, while the sum is 59.

The spelling of 43981194749 in words is "forty-three billion, nine hundred eighty-one million, one hundred ninety-four thousand, seven hundred forty-nine".