55127621 has 2 divisors, whose sum is σ = 55127622. Its totient is φ = 55127620.

The previous prime is 55127609. The next prime is 55127647. The reversal of 55127621 is 12672155.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 49773025 + 5354596 = 7055^2 + 2314^2 .

It is a cyclic number.

It is not a de Polignac number, because 55127621 - 2¹⁴ = 55111237 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55127321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27563810 + 27563811.

It is an arithmetic number, because the mean of its divisors is an integer number (27563811).

Almost surely, 2^55127621 is an apocalyptic number.

It is an amenable number.

55127621 is a deficient number, since it is larger than the sum of its proper divisors (1).

55127621 is an equidigital number, since it uses as much as digits as its factorization.

55127621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4200, while the sum is 29.

The square root of 55127621 is about 7424.7977076820. The cubic root of 55127621 is about 380.5891622522.

Adding to 55127621 its reverse (12672155), we get a palindrome (67799776).

The spelling of 55127621 in words is "fifty-five million, one hundred twenty-seven thousand, six hundred twenty-one".