55437281 has 2 divisors, whose sum is σ = 55437282. Its totient is φ = 55437280.

The previous prime is 55437253. The next prime is 55437293. The reversal of 55437281 is 18273455.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 40844881 + 14592400 = 6391^2 + 3820^2 .

It is a cyclic number.

It is not a de Polignac number, because 55437281 - 2¹⁰ = 55436257 is a prime.

It is a super-2 number, since 2×55437281² = 6146584249345922, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (55437181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27718640 + 27718641.

It is an arithmetic number, because the mean of its divisors is an integer number (27718641).

Almost surely, 2^55437281 is an apocalyptic number.

It is an amenable number.

55437281 is a deficient number, since it is larger than the sum of its proper divisors (1).

55437281 is an equidigital number, since it uses as much as digits as its factorization.

55437281 is an evil number, because the sum of its binary digits is even.

The product of its digits is 33600, while the sum is 35.

The square root of 55437281 is about 7445.6215993025. The cubic root of 55437281 is about 381.3004406612.

The spelling of 55437281 in words is "fifty-five million, four hundred thirty-seven thousand, two hundred eighty-one".