53125781 has 2 divisors, whose sum is σ = 53125782. Its totient is φ = 53125780.

The previous prime is 53125777. The next prime is 53125811. The reversal of 53125781 is 18752135.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 32103556 + 21022225 = 5666^2 + 4585^2 .

It is a cyclic number.

It is not a de Polignac number, because 53125781 - 2² = 53125777 is a prime.

It is a super-2 number, since 2×53125781² = 5644697213719922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (53125741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26562890 + 26562891.

It is an arithmetic number, because the mean of its divisors is an integer number (26562891).

Almost surely, 2^53125781 is an apocalyptic number.

It is an amenable number.

53125781 is a deficient number, since it is larger than the sum of its proper divisors (1).

53125781 is an equidigital number, since it uses as much as digits as its factorization.

53125781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8400, while the sum is 32.

The square root of 53125781 is about 7288.7434445177. The cubic root of 53125781 is about 375.9254912155.

The spelling of 53125781 in words is "fifty-three million, one hundred twenty-five thousand, seven hundred eighty-one".