64406231 has 2 divisors, whose sum is σ = 64406232. Its totient is φ = 64406230.

The previous prime is 64406213. The next prime is 64406239. The reversal of 64406231 is 13260446.

Together with previous prime (64406213) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 64406231 - 2¹⁴ = 64389847 is a prime.

It is a super-2 number, since 2×64406231² = 8296325183250722, which contains 22 as substring.

It is equal to p_3807710 and since 64406231 and 3807710 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 64406231.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64406239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32203115 + 32203116.

It is an arithmetic number, because the mean of its divisors is an integer number (32203116).

Almost surely, 2^64406231 is an apocalyptic number.

64406231 is a deficient number, since it is larger than the sum of its proper divisors (1).

64406231 is an equidigital number, since it uses as much as digits as its factorization.

64406231 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 26.

The square root of 64406231 is about 8025.3492758882. The cubic root of 64406231 is about 400.8445302501.

Adding to 64406231 its reverse (13260446), we get a palindrome (77666677).

The spelling of 64406231 in words is "sixty-four million, four hundred six thousand, two hundred thirty-one".