43913061509 has 4 divisors (see below), whose sum is σ = 44339402016. Its totient is φ = 43486721004.

The previous prime is 43913061503. The next prime is 43913061571. The reversal of 43913061509 is 90516031934.

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 a de Polignac number, because none of the positive numbers 2^k-43913061509 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43913061503) 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, 213170099 + ... + 213170304.

It is an arithmetic number, because the mean of its divisors is an integer number (11084850504).

Almost surely, 2^43913061509 is an apocalyptic number.

It is an amenable number.

43913061509 is a deficient number, since it is larger than the sum of its proper divisors (426340507).

43913061509 is a wasteful number, since it uses less digits than its factorization.

43913061509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 426340506.

The product of its (nonzero) digits is 87480, while the sum is 41.

The spelling of 43913061509 in words is "forty-three billion, nine hundred thirteen million, sixty-one thousand, five hundred nine".