64820137 has 2 divisors, whose sum is σ = 64820138. Its totient is φ = 64820136.

The previous prime is 64820117. The next prime is 64820143. The reversal of 64820137 is 73102846.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 49617936 + 15202201 = 7044^2 + 3899^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64820137 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 64820099 and 64820108.

It is not a weakly prime, because it can be changed into another prime (64820117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32410068 + 32410069.

It is an arithmetic number, because the mean of its divisors is an integer number (32410069).

Almost surely, 2^64820137 is an apocalyptic number.

It is an amenable number.

64820137 is a deficient number, since it is larger than the sum of its proper divisors (1).

64820137 is an equidigital number, since it uses as much as digits as its factorization.

64820137 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8064, while the sum is 31.

The square root of 64820137 is about 8051.0953913117. The cubic root of 64820137 is about 401.7013718246.

The spelling of 64820137 in words is "sixty-four million, eight hundred twenty thousand, one hundred thirty-seven".