64717951 has 2 divisors, whose sum is σ = 64717952. Its totient is φ = 64717950.

The previous prime is 64717907. The next prime is 64717969. The reversal of 64717951 is 15971746.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 64717951 - 2²¹ = 62620799 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64711951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32358975 + 32358976.

It is an arithmetic number, because the mean of its divisors is an integer number (32358976).

Almost surely, 2^64717951 is an apocalyptic number.

64717951 is a deficient number, since it is larger than the sum of its proper divisors (1).

64717951 is an equidigital number, since it uses as much as digits as its factorization.

64717951 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 52920, while the sum is 40.

The square root of 64717951 is about 8044.7467952696. The cubic root of 64717951 is about 401.4901728185.

The spelling of 64717951 in words is "sixty-four million, seven hundred seventeen thousand, nine hundred fifty-one".