1642487857 has 2 divisors, whose sum is σ = 1642487858. Its totient is φ = 1642487856.

The previous prime is 1642487797. The next prime is 1642487879. The reversal of 1642487857 is 7587842461.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1239321616 + 403166241 = 35204^2 + 20079^2 .

It is a cyclic number.

It is not a de Polignac number, because 1642487857 - 2⁷ = 1642487729 is a prime.

It is not a weakly prime, because it can be changed into another prime (1642485857) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 821243928 + 821243929.

It is an arithmetic number, because the mean of its divisors is an integer number (821243929).

Almost surely, 2^1642487857 is an apocalyptic number.

It is an amenable number.

1642487857 is a deficient number, since it is larger than the sum of its proper divisors (1).

1642487857 is an equidigital number, since it uses as much as digits as its factorization.

1642487857 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3010560, while the sum is 52.

The square root of 1642487857 is about 40527.6184471775. The cubic root of 1642487857 is about 1179.8697206068.

The spelling of 1642487857 in words is "one billion, six hundred forty-two million, four hundred eighty-seven thousand, eight hundred fifty-seven".