64405031 has 2 divisors, whose sum is σ = 64405032. Its totient is φ = 64405030.

The previous prime is 64405021. The next prime is 64405057. The reversal of 64405031 is 13050446.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64405031 is a prime.

It is a super-2 number, since 2×64405031² = 8296016036221922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 64404988 and 64405006.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64405021) 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, 32202515 + 32202516.

It is an arithmetic number, because the mean of its divisors is an integer number (32202516).

Almost surely, 2^64405031 is an apocalyptic number.

64405031 is a deficient number, since it is larger than the sum of its proper divisors (1).

64405031 is an equidigital number, since it uses as much as digits as its factorization.

64405031 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 64405031 is about 8025.2745124388. The cubic root of 64405031 is about 400.8420407579.

Adding to 64405031 its reverse (13050446), we get a palindrome (77455477).

The spelling of 64405031 in words is "sixty-four million, four hundred five thousand, thirty-one".