43321101491 has 2 divisors, whose sum is σ = 43321101492. Its totient is φ = 43321101490.

The previous prime is 43321101457. The next prime is 43321101517. The reversal of 43321101491 is 19410112334.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 43321101491 - 2²² = 43316907187 is a prime.

It is not a weakly prime, because it can be changed into another prime (43321101991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21660550745 + 21660550746.

It is an arithmetic number, because the mean of its divisors is an integer number (21660550746).

Almost surely, 2^43321101491 is an apocalyptic number.

43321101491 is a deficient number, since it is larger than the sum of its proper divisors (1).

43321101491 is an equidigital number, since it uses as much as digits as its factorization.

43321101491 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592, while the sum is 29.

The spelling of 43321101491 in words is "forty-three billion, three hundred twenty-one million, one hundred one thousand, four hundred ninety-one".