1634841421091 has 2 divisors, whose sum is σ = 1634841421092. Its totient is φ = 1634841421090.

The previous prime is 1634841421069. The next prime is 1634841421133. The reversal of 1634841421091 is 1901241484361.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1634841421091 is a prime.

It is a super-2 number, since 2×1634841421091² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1634841421391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 817420710545 + 817420710546.

It is an arithmetic number, because the mean of its divisors is an integer number (817420710546).

Almost surely, 2^{1634841421091} is an apocalyptic number.

1634841421091 is a deficient number, since it is larger than the sum of its proper divisors (1).

1634841421091 is an equidigital number, since it uses as much as digits as its factorization.

1634841421091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 165888, while the sum is 44.

The spelling of 1634841421091 in words is "one trillion, six hundred thirty-four billion, eight hundred forty-one million, four hundred twenty-one thousand, ninety-one".