64194409 has 2 divisors, whose sum is σ = 64194410. Its totient is φ = 64194408.

The previous prime is 64194379. The next prime is 64194421. The reversal of 64194409 is 90449146.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 61544025 + 2650384 = 7845^2 + 1628^2 .

It is a cyclic number.

It is not a de Polignac number, because 64194409 - 2²¹ = 62097257 is a prime.

It is not a weakly prime, because it can be changed into another prime (64194469) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32097204 + 32097205.

It is an arithmetic number, because the mean of its divisors is an integer number (32097205).

Almost surely, 2^64194409 is an apocalyptic number.

It is an amenable number.

64194409 is a deficient number, since it is larger than the sum of its proper divisors (1).

64194409 is an equidigital number, since it uses as much as digits as its factorization.

64194409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 31104, while the sum is 37.

The square root of 64194409 is about 8012.1413492274. The cubic root of 64194409 is about 400.4046093402.

The spelling of 64194409 in words is "sixty-four million, one hundred ninety-four thousand, four hundred nine".