55639427 has 2 divisors, whose sum is σ = 55639428. Its totient is φ = 55639426.

The previous prime is 55639417. The next prime is 55639447. The reversal of 55639427 is 72493655.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 55639427 - 2¹² = 55635331 is a prime.

It is not a weakly prime, because it can be changed into another prime (55639417) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27819713 + 27819714.

It is an arithmetic number, because the mean of its divisors is an integer number (27819714).

Almost surely, 2^55639427 is an apocalyptic number.

55639427 is a deficient number, since it is larger than the sum of its proper divisors (1).

55639427 is an equidigital number, since it uses as much as digits as its factorization.

55639427 is an evil number, because the sum of its binary digits is even.

The product of its digits is 226800, while the sum is 41.

The square root of 55639427 is about 7459.1840706608. The cubic root of 55639427 is about 381.7633353106.

The spelling of 55639427 in words is "fifty-five million, six hundred thirty-nine thousand, four hundred twenty-seven".