55625551 has 2 divisors, whose sum is σ = 55625552. Its totient is φ = 55625550.

The previous prime is 55625539. The next prime is 55625573. The reversal of 55625551 is 15552655.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 55625551 - 2⁵ = 55625519 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55625651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27812775 + 27812776.

It is an arithmetic number, because the mean of its divisors is an integer number (27812776).

Almost surely, 2^55625551 is an apocalyptic number.

55625551 is a deficient number, since it is larger than the sum of its proper divisors (1).

55625551 is an equidigital number, since it uses as much as digits as its factorization.

55625551 is an evil number, because the sum of its binary digits is even.

The product of its digits is 37500, while the sum is 34.

The square root of 55625551 is about 7458.2538841206. The cubic root of 55625551 is about 381.7315964954.

The spelling of 55625551 in words is "fifty-five million, six hundred twenty-five thousand, five hundred fifty-one".