55729939 has 2 divisors, whose sum is σ = 55729940. Its totient is φ = 55729938.

The previous prime is 55729937. The next prime is 55729969. The reversal of 55729939 is 93992755.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 55729939 - 2¹ = 55729937 is a prime.

It is a super-2 number, since 2×55729939² = 6211652201887442, which contains 22 as substring.

Together with 55729937, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 55729892 and 55729901.

It is not a weakly prime, because it can be changed into another prime (55729937) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27864969 + 27864970.

It is an arithmetic number, because the mean of its divisors is an integer number (27864970).

Almost surely, 2^55729939 is an apocalyptic number.

55729939 is a deficient number, since it is larger than the sum of its proper divisors (1).

55729939 is an equidigital number, since it uses as much as digits as its factorization.

55729939 is an evil number, because the sum of its binary digits is even.

The product of its digits is 765450, while the sum is 49.

The square root of 55729939 is about 7465.2487567395. The cubic root of 55729939 is about 381.9702356130.

The spelling of 55729939 in words is "fifty-five million, seven hundred twenty-nine thousand, nine hundred thirty-nine".