63939553 has 2 divisors, whose sum is σ = 63939554. Its totient is φ = 63939552.

The previous prime is 63939523. The next prime is 63939607. The reversal of 63939553 is 35593936.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 41062464 + 22877089 = 6408^2 + 4783^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-63939553 is a prime.

It is not a weakly prime, because it can be changed into another prime (63939523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31969776 + 31969777.

It is an arithmetic number, because the mean of its divisors is an integer number (31969777).

Almost surely, 2^63939553 is an apocalyptic number.

It is an amenable number.

63939553 is a deficient number, since it is larger than the sum of its proper divisors (1).

63939553 is an equidigital number, since it uses as much as digits as its factorization.

63939553 is an evil number, because the sum of its binary digits is even.

The product of its digits is 328050, while the sum is 43.

The square root of 63939553 is about 7996.2211700278. The cubic root of 63939553 is about 399.8740290825.

The spelling of 63939553 in words is "sixty-three million, nine hundred thirty-nine thousand, five hundred fifty-three".