2157442459 has 2 divisors, whose sum is σ = 2157442460. Its totient is φ = 2157442458.

The previous prime is 2157442421. The next prime is 2157442471. The reversal of 2157442459 is 9542447512.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2157442459 is a prime.

It is not a weakly prime, because it can be changed into another prime (2157442759) 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, 1078721229 + 1078721230.

It is an arithmetic number, because the mean of its divisors is an integer number (1078721230).

Almost surely, 2^2157442459 is an apocalyptic number.

2157442459 is a deficient number, since it is larger than the sum of its proper divisors (1).

2157442459 is an equidigital number, since it uses as much as digits as its factorization.

2157442459 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 403200, while the sum is 43.

The square root of 2157442459 is about 46448.2772446944. The cubic root of 2157442459 is about 1292.1504222410.

The spelling of 2157442459 in words is "two billion, one hundred fifty-seven million, four hundred forty-two thousand, four hundred fifty-nine".