1642895801 has 2 divisors, whose sum is σ = 1642895802. Its totient is φ = 1642895800.

The previous prime is 1642895777. The next prime is 1642895833. The reversal of 1642895801 is 1085982461.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 968143225 + 674752576 = 31115^2 + 25976^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1642895801 is a prime.

It is a super-2 number, since 2×1642895801² = 5398213225886863202, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1642895101) 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, 821447900 + 821447901.

It is an arithmetic number, because the mean of its divisors is an integer number (821447901).

Almost surely, 2^1642895801 is an apocalyptic number.

It is an amenable number.

1642895801 is a deficient number, since it is larger than the sum of its proper divisors (1).

1642895801 is an equidigital number, since it uses as much as digits as its factorization.

1642895801 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 138240, while the sum is 44.

The square root of 1642895801 is about 40532.6510482598. The cubic root of 1642895801 is about 1179.9673937653.

The spelling of 1642895801 in words is "one billion, six hundred forty-two million, eight hundred ninety-five thousand, eight hundred one".