53116621 has 2 divisors, whose sum is σ = 53116622. Its totient is φ = 53116620.

The previous prime is 53116601. The next prime is 53116633. The reversal of 53116621 is 12661135.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 36421225 + 16695396 = 6035^2 + 4086^2 .

It is a cyclic number.

It is not a de Polignac number, because 53116621 - 2⁷ = 53116493 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (53116601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26558310 + 26558311.

It is an arithmetic number, because the mean of its divisors is an integer number (26558311).

Almost surely, 2^53116621 is an apocalyptic number.

It is an amenable number.

53116621 is a deficient number, since it is larger than the sum of its proper divisors (1).

53116621 is an equidigital number, since it uses as much as digits as its factorization.

53116621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1080, while the sum is 25.

The square root of 53116621 is about 7288.1150512324. The cubic root of 53116621 is about 375.9038841579.

Adding to 53116621 its reverse (12661135), we get a palindrome (65777756).

The spelling of 53116621 in words is "fifty-three million, one hundred sixteen thousand, six hundred twenty-one".