53626981 has 2 divisors, whose sum is σ = 53626982. Its totient is φ = 53626980.

The previous prime is 53626927. The next prime is 53626997. The reversal of 53626981 is 18962635.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 35640900 + 17986081 = 5970^2 + 4241^2 .

It is a cyclic number.

It is not a de Polignac number, because 53626981 - 2¹¹ = 53624933 is a prime.

It is a super-2 number, since 2×53626981² = 5751706182348722, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (53629981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26813490 + 26813491.

It is an arithmetic number, because the mean of its divisors is an integer number (26813491).

Almost surely, 2^53626981 is an apocalyptic number.

53626981 is the 4632-nd centered pentagonal number.

It is an amenable number.

53626981 is a deficient number, since it is larger than the sum of its proper divisors (1).

53626981 is an equidigital number, since it uses as much as digits as its factorization.

53626981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 77760, while the sum is 40.

The square root of 53626981 is about 7323.0445171390. The cubic root of 53626981 is about 377.1039801182.

The spelling of 53626981 in words is "fifty-three million, six hundred twenty-six thousand, nine hundred eighty-one".