75978061 has 2 divisors, whose sum is σ = 75978062. Its totient is φ = 75978060.

The previous prime is 75978059. The next prime is 75978073. The reversal of 75978061 is 16087957.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 65512836 + 10465225 = 8094^2 + 3235^2 .

It is a cyclic number.

It is not a de Polignac number, because 75978061 - 2¹ = 75978059 is a prime.

Together with 75978059, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 75977999 and 75978017.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (75978761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37989030 + 37989031.

It is an arithmetic number, because the mean of its divisors is an integer number (37989031).

Almost surely, 2^75978061 is an apocalyptic number.

It is an amenable number.

75978061 is a deficient number, since it is larger than the sum of its proper divisors (1).

75978061 is an equidigital number, since it uses as much as digits as its factorization.

75978061 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 105840, while the sum is 43.

The square root of 75978061 is about 8716.5395083141. The cubic root of 75978061 is about 423.5415958478.

The spelling of 75978061 in words is "seventy-five million, nine hundred seventy-eight thousand, sixty-one".