63640531 has 2 divisors, whose sum is σ = 63640532. Its totient is φ = 63640530.

The previous prime is 63640483. The next prime is 63640561. The reversal of 63640531 is 13504636.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 63640531 - 2¹³ = 63632339 is a prime.

It is a super-2 number, since 2×63640531² = 8100234371923922, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 63640531.

It is not a weakly prime, because it can be changed into another prime (63640561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31820265 + 31820266.

It is an arithmetic number, because the mean of its divisors is an integer number (31820266).

Almost surely, 2^63640531 is an apocalyptic number.

63640531 is a deficient number, since it is larger than the sum of its proper divisors (1).

63640531 is an equidigital number, since it uses as much as digits as its factorization.

63640531 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6480, while the sum is 28.

The square root of 63640531 is about 7977.5015512377. The cubic root of 63640531 is about 399.2496997538.

The spelling of 63640531 in words is "sixty-three million, six hundred forty thousand, five hundred thirty-one".