2145423242491 has 2 divisors, whose sum is σ = 2145423242492. Its totient is φ = 2145423242490.

The previous prime is 2145423242489. The next prime is 2145423242533. The reversal of 2145423242491 is 1942423245412.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2145423242491 - 2¹ = 2145423242489 is a prime.

Together with 2145423242489, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (2145423242471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1072711621245 + 1072711621246.

It is an arithmetic number, because the mean of its divisors is an integer number (1072711621246).

Almost surely, 2^{2145423242491} is an apocalyptic number.

2145423242491 is a deficient number, since it is larger than the sum of its proper divisors (1).

2145423242491 is an equidigital number, since it uses as much as digits as its factorization.

2145423242491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 552960, while the sum is 43.

The spelling of 2145423242491 in words is "two trillion, one hundred forty-five billion, four hundred twenty-three million, two hundred forty-two thousand, four hundred ninety-one".