55147207 has 2 divisors, whose sum is σ = 55147208. Its totient is φ = 55147206.

The previous prime is 55147129. The next prime is 55147217. The reversal of 55147207 is 70274155.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55147207 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55147217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27573603 + 27573604.

It is an arithmetic number, because the mean of its divisors is an integer number (27573604).

Almost surely, 2^55147207 is an apocalyptic number.

55147207 is a deficient number, since it is larger than the sum of its proper divisors (1).

55147207 is an equidigital number, since it uses as much as digits as its factorization.

55147207 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9800, while the sum is 31.

The square root of 55147207 is about 7426.1165490450. The cubic root of 55147207 is about 380.6342294168.

It can be divided in two parts, 5514 and 7207, that added together give a palindrome (12721).

The spelling of 55147207 in words is "fifty-five million, one hundred forty-seven thousand, two hundred seven".