64542133 has 2 divisors, whose sum is σ = 64542134. Its totient is φ = 64542132.

The previous prime is 64542113. The next prime is 64542143. The reversal of 64542133 is 33124546.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 60186564 + 4355569 = 7758^2 + 2087^2 .

It is a cyclic number.

It is not a de Polignac number, because 64542133 - 2⁹ = 64541621 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64542113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32271066 + 32271067.

It is an arithmetic number, because the mean of its divisors is an integer number (32271067).

Almost surely, 2^64542133 is an apocalyptic number.

It is an amenable number.

64542133 is a deficient number, since it is larger than the sum of its proper divisors (1).

64542133 is an equidigital number, since it uses as much as digits as its factorization.

64542133 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8640, while the sum is 28.

The square root of 64542133 is about 8033.8118598832. The cubic root of 64542133 is about 401.1262695658.

Adding to 64542133 its reverse (33124546), we get a palindrome (97666679).

It can be divided in two parts, 645 and 42133, that added together give a triangular number (42778 = T₂₉₂).

The spelling of 64542133 in words is "sixty-four million, five hundred forty-two thousand, one hundred thirty-three".