64689451 has 2 divisors, whose sum is σ = 64689452. Its totient is φ = 64689450.

The previous prime is 64689407. The next prime is 64689473. The reversal of 64689451 is 15498646.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 64689451 - 2⁷ = 64689323 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 64689398 and 64689407.

It is not a weakly prime, because it can be changed into another prime (64689151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32344725 + 32344726.

It is an arithmetic number, because the mean of its divisors is an integer number (32344726).

Almost surely, 2^64689451 is an apocalyptic number.

64689451 is a deficient number, since it is larger than the sum of its proper divisors (1).

64689451 is an equidigital number, since it uses as much as digits as its factorization.

64689451 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 207360, while the sum is 43.

The square root of 64689451 is about 8042.9752579503. The cubic root of 64689451 is about 401.4312291003.

The spelling of 64689451 in words is "sixty-four million, six hundred eighty-nine thousand, four hundred fifty-one".