55238587 has 2 divisors, whose sum is σ = 55238588. Its totient is φ = 55238586.

The previous prime is 55238569. The next prime is 55238629. The reversal of 55238587 is 78583255.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55238587 is a prime.

It is not a weakly prime, because it can be changed into another prime (55238087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27619293 + 27619294.

It is an arithmetic number, because the mean of its divisors is an integer number (27619294).

Almost surely, 2^55238587 is an apocalyptic number.

55238587 is a deficient number, since it is larger than the sum of its proper divisors (1).

55238587 is an equidigital number, since it uses as much as digits as its factorization.

55238587 is an evil number, because the sum of its binary digits is even.

The product of its digits is 336000, while the sum is 43.

The square root of 55238587 is about 7432.2666125483. The cubic root of 55238587 is about 380.8443528528.

The spelling of 55238587 in words is "fifty-five million, two hundred thirty-eight thousand, five hundred eighty-seven".