55978061 has 2 divisors, whose sum is σ = 55978062. Its totient is φ = 55978060.

The previous prime is 55978049. The next prime is 55978163. The reversal of 55978061 is 16087955.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 52345225 + 3632836 = 7235^2 + 1906^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55978061 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55978001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27989030 + 27989031.

It is an arithmetic number, because the mean of its divisors is an integer number (27989031).

Almost surely, 2^55978061 is an apocalyptic number.

It is an amenable number.

55978061 is a deficient number, since it is larger than the sum of its proper divisors (1).

55978061 is an equidigital number, since it uses as much as digits as its factorization.

55978061 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 75600, while the sum is 41.

The square root of 55978061 is about 7481.8487688539. The cubic root of 55978061 is about 382.5362683652.

The spelling of 55978061 in words is "fifty-five million, nine hundred seventy-eight thousand, sixty-one".