55242479 has 2 divisors, whose sum is σ = 55242480. Its totient is φ = 55242478.

The previous prime is 55242391. The next prime is 55242497. The reversal of 55242479 is 97424255.

Together with next prime (55242497) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 55242479 - 2¹² = 55238383 is a prime.

It is a plaindrome in base 16.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55242679) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27621239 + 27621240.

It is an arithmetic number, because the mean of its divisors is an integer number (27621240).

Almost surely, 2^55242479 is an apocalyptic number.

55242479 is a deficient number, since it is larger than the sum of its proper divisors (1).

55242479 is an equidigital number, since it uses as much as digits as its factorization.

55242479 is an evil number, because the sum of its binary digits is even.

The product of its digits is 100800, while the sum is 38.

The square root of 55242479 is about 7432.5284392325. The cubic root of 55242479 is about 380.8532971524.

The spelling of 55242479 in words is "fifty-five million, two hundred forty-two thousand, four hundred seventy-nine".