2187942457 has 2 divisors, whose sum is σ = 2187942458. Its totient is φ = 2187942456.

The previous prime is 2187942403. The next prime is 2187942467. The reversal of 2187942457 is 7542497812.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2075349136 + 112593321 = 45556^2 + 10611^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2187942457 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2187942457.

It is not a weakly prime, because it can be changed into another prime (2187942467) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1093971228 + 1093971229.

It is an arithmetic number, because the mean of its divisors is an integer number (1093971229).

Almost surely, 2^2187942457 is an apocalyptic number.

It is an amenable number.

2187942457 is a deficient number, since it is larger than the sum of its proper divisors (1).

2187942457 is an equidigital number, since it uses as much as digits as its factorization.

2187942457 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1128960, while the sum is 49.

The square root of 2187942457 is about 46775.4471598081. The cubic root of 2187942457 is about 1298.2110416716.

The spelling of 2187942457 in words is "two billion, one hundred eighty-seven million, nine hundred forty-two thousand, four hundred fifty-seven".