63791813 has 2 divisors, whose sum is σ = 63791814. Its totient is φ = 63791812.

The previous prime is 63791801. The next prime is 63791863. The reversal of 63791813 is 31819736.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 53919649 + 9872164 = 7343^2 + 3142^2 .

It is a cyclic number.

It is not a de Polignac number, because 63791813 - 2¹⁴ = 63775429 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (63791863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31895906 + 31895907.

It is an arithmetic number, because the mean of its divisors is an integer number (31895907).

Almost surely, 2^63791813 is an apocalyptic number.

It is an amenable number.

63791813 is a deficient number, since it is larger than the sum of its proper divisors (1).

63791813 is an equidigital number, since it uses as much as digits as its factorization.

63791813 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27216, while the sum is 38.

The square root of 63791813 is about 7986.9777137538. The cubic root of 63791813 is about 399.5658059427.

It can be divided in two parts, 6379 and 1813, that added together give a 13-th power (8192 = 2¹³).

The spelling of 63791813 in words is "sixty-three million, seven hundred ninety-one thousand, eight hundred thirteen".