53366981 has 4 divisors (see below), whose sum is σ = 53966700. Its totient is φ = 52767264.

The previous prime is 53366977. The next prime is 53366993. The reversal of 53366981 is 18966335.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6225025 + 47141956 = 2495^2 + 6866^2 .

It is a cyclic number.

It is not a de Polignac number, because 53366981 - 2² = 53366977 is a prime.

It is a super-2 number, since 2×53366981² = 5696069322108722, 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 (53366941) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 299726 + ... + 299903.

It is an arithmetic number, because the mean of its divisors is an integer number (13491675).

Almost surely, 2^53366981 is an apocalyptic number.

It is an amenable number.

53366981 is a deficient number, since it is larger than the sum of its proper divisors (599719).

53366981 is an equidigital number, since it uses as much as digits as its factorization.

53366981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 599718.

The product of its digits is 116640, while the sum is 41.

The square root of 53366981 is about 7305.2707684247. The cubic root of 53366981 is about 376.4935540778.

The spelling of 53366981 in words is "fifty-three million, three hundred sixty-six thousand, nine hundred eighty-one".