55281137 has 2 divisors, whose sum is σ = 55281138. Its totient is φ = 55281136.

The previous prime is 55281077. The next prime is 55281139. The reversal of 55281137 is 73118255.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 45819361 + 9461776 = 6769^2 + 3076^2 .

It is a cyclic number.

It is not a de Polignac number, because 55281137 - 2⁶ = 55281073 is a prime.

Together with 55281139, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (55281139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27640568 + 27640569.

It is an arithmetic number, because the mean of its divisors is an integer number (27640569).

Almost surely, 2^55281137 is an apocalyptic number.

It is an amenable number.

55281137 is a deficient number, since it is larger than the sum of its proper divisors (1).

55281137 is an equidigital number, since it uses as much as digits as its factorization.

55281137 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8400, while the sum is 32.

The square root of 55281137 is about 7435.1285799238. The cubic root of 55281137 is about 380.9421152385.

The spelling of 55281137 in words is "fifty-five million, two hundred eighty-one thousand, one hundred thirty-seven".