77030561 has 2 divisors, whose sum is σ = 77030562. Its totient is φ = 77030560.

The previous prime is 77030543. The next prime is 77030573. The reversal of 77030561 is 16503077.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 40246336 + 36784225 = 6344^2 + 6065^2 .

It is a cyclic number.

It is not a de Polignac number, because 77030561 - 2⁶ = 77030497 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (77030521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38515280 + 38515281.

It is an arithmetic number, because the mean of its divisors is an integer number (38515281).

Almost surely, 2^77030561 is an apocalyptic number.

It is an amenable number.

77030561 is a deficient number, since it is larger than the sum of its proper divisors (1).

77030561 is an equidigital number, since it uses as much as digits as its factorization.

77030561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4410, while the sum is 29.

The square root of 77030561 is about 8776.7055892288. The cubic root of 77030561 is about 425.4883631794.

The spelling of 77030561 in words is "seventy-seven million, thirty thousand, five hundred sixty-one".