2123450491 has 2 divisors, whose sum is σ = 2123450492. Its totient is φ = 2123450490.

The previous prime is 2123450489. The next prime is 2123450509. The reversal of 2123450491 is 1940543212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2123450491 - 2¹ = 2123450489 is a prime.

Together with 2123450489, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (2123450411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1061725245 + 1061725246.

It is an arithmetic number, because the mean of its divisors is an integer number (1061725246).

Almost surely, 2^2123450491 is an apocalyptic number.

2123450491 is a deficient number, since it is larger than the sum of its proper divisors (1).

2123450491 is an equidigital number, since it uses as much as digits as its factorization.

2123450491 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 2123450491 is about 46080.9124367129. The cubic root of 2123450491 is about 1285.3282311907.

The spelling of 2123450491 in words is "two billion, one hundred twenty-three million, four hundred fifty thousand, four hundred ninety-one".