64140631 has 2 divisors, whose sum is σ = 64140632. Its totient is φ = 64140630.

The previous prime is 64140539. The next prime is 64140667. The reversal of 64140631 is 13604146.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 64140631 - 2¹⁷ = 64009559 is a prime.

It is a super-2 number, since 2×64140631² = 8228041090156322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 64140596 and 64140605.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64140691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32070315 + 32070316.

It is an arithmetic number, because the mean of its divisors is an integer number (32070316).

Almost surely, 2^64140631 is an apocalyptic number.

64140631 is a deficient number, since it is larger than the sum of its proper divisors (1).

64140631 is an equidigital number, since it uses as much as digits as its factorization.

64140631 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 64140631 is about 8008.7846144094. The cubic root of 64140631 is about 400.2927669166.

Adding to 64140631 its reverse (13604146), we get a palindrome (77744777).

The spelling of 64140631 in words is "sixty-four million, one hundred forty thousand, six hundred thirty-one".