64443131 has 2 divisors, whose sum is σ = 64443132. Its totient is φ = 64443130.

The previous prime is 64443097. The next prime is 64443139. The reversal of 64443131 is 13134446.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 64443131 - 2¹⁰ = 64442107 is a prime.

It is a super-2 number, since 2×64443131² = 8305834266166322, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 64443131.

It is not a weakly prime, because it can be changed into another prime (64443139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32221565 + 32221566.

It is an arithmetic number, because the mean of its divisors is an integer number (32221566).

Almost surely, 2^64443131 is an apocalyptic number.

64443131 is a deficient number, since it is larger than the sum of its proper divisors (1).

64443131 is an equidigital number, since it uses as much as digits as its factorization.

64443131 is an evil number, because the sum of its binary digits is even.

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

The square root of 64443131 is about 8027.6479120599. The cubic root of 64443131 is about 400.9210670442.

Adding to 64443131 its reverse (13134446), we get a palindrome (77577577).

The spelling of 64443131 in words is "sixty-four million, four hundred forty-three thousand, one hundred thirty-one".