55061551 has 2 divisors, whose sum is σ = 55061552. Its totient is φ = 55061550.

The previous prime is 55061507. The next prime is 55061557. The reversal of 55061551 is 15516055.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 55061551 - 2²³ = 46672943 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55061557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27530775 + 27530776.

It is an arithmetic number, because the mean of its divisors is an integer number (27530776).

Almost surely, 2^55061551 is an apocalyptic number.

55061551 is a deficient number, since it is larger than the sum of its proper divisors (1).

55061551 is an equidigital number, since it uses as much as digits as its factorization.

55061551 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3750, while the sum is 28.

The square root of 55061551 is about 7420.3470943077. The cubic root of 55061551 is about 380.4370571443.

The spelling of 55061551 in words is "fifty-five million, sixty-one thousand, five hundred fifty-one".