43687993451 has 2 divisors, whose sum is σ = 43687993452. Its totient is φ = 43687993450.

The previous prime is 43687993403. The next prime is 43687993469. The reversal of 43687993451 is 15439978634.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-43687993451 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (43687933451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21843996725 + 21843996726.

It is an arithmetic number, because the mean of its divisors is an integer number (21843996726).

Almost surely, 2^43687993451 is an apocalyptic number.

43687993451 is a deficient number, since it is larger than the sum of its proper divisors (1).

43687993451 is an equidigital number, since it uses as much as digits as its factorization.

43687993451 is an evil number, because the sum of its binary digits is even.

The product of its digits is 19595520, while the sum is 59.

The spelling of 43687993451 in words is "forty-three billion, six hundred eighty-seven million, nine hundred ninety-three thousand, four hundred fifty-one".