54815557 has 2 divisors, whose sum is σ = 54815558. Its totient is φ = 54815556.

The previous prime is 54815507. The next prime is 54815561. The reversal of 54815557 is 75551845.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 42432196 + 12383361 = 6514^2 + 3519^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-54815557 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 (54815507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27407778 + 27407779.

It is an arithmetic number, because the mean of its divisors is an integer number (27407779).

Almost surely, 2^54815557 is an apocalyptic number.

It is an amenable number.

54815557 is a deficient number, since it is larger than the sum of its proper divisors (1).

54815557 is an equidigital number, since it uses as much as digits as its factorization.

54815557 is an evil number, because the sum of its binary digits is even.

The product of its digits is 140000, while the sum is 40.

The square root of 54815557 is about 7403.7528997124. The cubic root of 54815557 is about 379.8696621328.

The spelling of 54815557 in words is "fifty-four million, eight hundred fifteen thousand, five hundred fifty-seven".