43215683723 has 2 divisors, whose sum is σ = 43215683724. Its totient is φ = 43215683722.

The previous prime is 43215683689. The next prime is 43215683759. The reversal of 43215683723 is 32738651234.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-43215683723 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (43215683773) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21607841861 + 21607841862.

It is an arithmetic number, because the mean of its divisors is an integer number (21607841862).

Almost surely, 2^43215683723 is an apocalyptic number.

43215683723 is a deficient number, since it is larger than the sum of its proper divisors (1).

43215683723 is an equidigital number, since it uses as much as digits as its factorization.

43215683723 is an evil number, because the sum of its binary digits is even.

The product of its digits is 725760, while the sum is 44.

The spelling of 43215683723 in words is "forty-three billion, two hundred fifteen million, six hundred eighty-three thousand, seven hundred twenty-three".