53416781 has 6 divisors (see below), whose sum is σ = 58714446. Its totient is φ = 48560600.

The previous prime is 53416777. The next prime is 53416799. The reversal of 53416781 is 18761435.

It can be written as a sum of positive squares in only one way, i.e., 34633225 + 18783556 = 5885^2 + 4334^2 .

It is not a de Polignac number, because 53416781 - 2² = 53416777 is a prime.

It is a super-2 number, since 2×53416781² = 5706704984803922, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53416081) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 220610 + ... + 220851.

It is an arithmetic number, because the mean of its divisors is an integer number (9785741).

Almost surely, 2^53416781 is an apocalyptic number.

It is an amenable number.

53416781 is a deficient number, since it is larger than the sum of its proper divisors (5297665).

53416781 is a wasteful number, since it uses less digits than its factorization.

53416781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 441483 (or 441472 counting only the distinct ones).

The product of its digits is 20160, while the sum is 35.

The square root of 53416781 is about 7308.6784715159. The cubic root of 53416781 is about 376.6106274041.

The spelling of 53416781 in words is "fifty-three million, four hundred sixteen thousand, seven hundred eighty-one".