55715551 has 2 divisors, whose sum is σ = 55715552. Its totient is φ = 55715550.

The previous prime is 55715507. The next prime is 55715557. The reversal of 55715551 is 15551755.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 55715551 - 2²³ = 47326943 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55715557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27857775 + 27857776.

It is an arithmetic number, because the mean of its divisors is an integer number (27857776).

Almost surely, 2^55715551 is an apocalyptic number.

55715551 is a deficient number, since it is larger than the sum of its proper divisors (1).

55715551 is an equidigital number, since it uses as much as digits as its factorization.

55715551 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 21875, while the sum is 34.

The square root of 55715551 is about 7464.2850293916. The cubic root of 55715551 is about 381.9373612378.

The spelling of 55715551 in words is "fifty-five million, seven hundred fifteen thousand, five hundred fifty-one".