64198081 has 2 divisors, whose sum is σ = 64198082. Its totient is φ = 64198080.

The previous prime is 64198067. The next prime is 64198091. The reversal of 64198081 is 18089146.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 36108081 + 28090000 = 6009^2 + 5300^2 .

It is a cyclic number.

It is not a de Polignac number, because 64198081 - 2⁵ = 64198049 is a prime.

It is a super-2 number, since 2×64198081² = 8242787208165122, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 64198081.

It is not a weakly prime, because it can be changed into another prime (64198021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32099040 + 32099041.

It is an arithmetic number, because the mean of its divisors is an integer number (32099041).

Almost surely, 2^64198081 is an apocalyptic number.

It is an amenable number.

64198081 is a deficient number, since it is larger than the sum of its proper divisors (1).

64198081 is an equidigital number, since it uses as much as digits as its factorization.

64198081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13824, while the sum is 37.

The square root of 64198081 is about 8012.3704981734. The cubic root of 64198081 is about 400.4122437418.

The spelling of 64198081 in words is "sixty-four million, one hundred ninety-eight thousand, eighty-one".