64717231 has 2 divisors, whose sum is σ = 64717232. Its totient is φ = 64717230.

The previous prime is 64717217. The next prime is 64717267. The reversal of 64717231 is 13271746.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 64717231 - 2¹⁵ = 64684463 is a prime.

It is a super-2 number, since 2×64717231² = 8376639976614722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 64717193 and 64717202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64717291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32358615 + 32358616.

It is an arithmetic number, because the mean of its divisors is an integer number (32358616).

Almost surely, 2^64717231 is an apocalyptic number.

64717231 is a deficient number, since it is larger than the sum of its proper divisors (1).

64717231 is an equidigital number, since it uses as much as digits as its factorization.

64717231 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7056, while the sum is 31.

The square root of 64717231 is about 8044.7020454458. The cubic root of 64717231 is about 401.4886839271.

Adding to 64717231 its reverse (13271746), we get a palindrome (77988977).

The spelling of 64717231 in words is "sixty-four million, seven hundred seventeen thousand, two hundred thirty-one".