53681381 has 8 divisors (see below), whose sum is σ = 58147320. Its totient is φ = 49263552.

The previous prime is 53681377. The next prime is 53681431. The reversal of 53681381 is 18318635.

It can be written as a sum of positive squares in 4 ways, for example, as 16532356 + 37149025 = 4066^2 + 6095^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 53681381 - 2² = 53681377 is a prime.

It is a super-2 number, since 2×53681381² = 5763381332134322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53681321) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9686 + ... + 14183.

It is an arithmetic number, because the mean of its divisors is an integer number (7268415).

Almost surely, 2^53681381 is an apocalyptic number.

It is an amenable number.

53681381 is a deficient number, since it is larger than the sum of its proper divisors (4465939).

53681381 is a wasteful number, since it uses less digits than its factorization.

53681381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24055.

The product of its digits is 17280, while the sum is 35.

The square root of 53681381 is about 7326.7578778065. The cubic root of 53681381 is about 377.2314503040.

The spelling of 53681381 in words is "fifty-three million, six hundred eighty-one thousand, three hundred eighty-one".