64821137 has 2 divisors, whose sum is σ = 64821138. Its totient is φ = 64821136.

The previous prime is 64821079. The next prime is 64821149. The reversal of 64821137 is 73112846.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 54523456 + 10297681 = 7384^2 + 3209^2 .

It is a cyclic number.

It is not a de Polignac number, because 64821137 - 2¹² = 64817041 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (64821157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32410568 + 32410569.

It is an arithmetic number, because the mean of its divisors is an integer number (32410569).

Almost surely, 2^64821137 is an apocalyptic number.

It is an amenable number.

64821137 is a deficient number, since it is larger than the sum of its proper divisors (1).

64821137 is an equidigital number, since it uses as much as digits as its factorization.

64821137 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8064, while the sum is 32.

The square root of 64821137 is about 8051.1574944228. The cubic root of 64821137 is about 401.7034375371.

The spelling of 64821137 in words is "sixty-four million, eight hundred twenty-one thousand, one hundred thirty-seven".