77445061 has 2 divisors, whose sum is σ = 77445062. Its totient is φ = 77445060.

The previous prime is 77444999. The next prime is 77445073. The reversal of 77445061 is 16054477.

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., 71656225 + 5788836 = 8465^2 + 2406^2 .

It is a cyclic number.

It is not a de Polignac number, because 77445061 - 2¹¹ = 77443013 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77440061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38722530 + 38722531.

It is an arithmetic number, because the mean of its divisors is an integer number (38722531).

Almost surely, 2^77445061 is an apocalyptic number.

It is an amenable number.

77445061 is a deficient number, since it is larger than the sum of its proper divisors (1).

77445061 is an equidigital number, since it uses as much as digits as its factorization.

77445061 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23520, while the sum is 34.

The square root of 77445061 is about 8800.2875521201. The cubic root of 77445061 is about 426.2501799949.

The spelling of 77445061 in words is "seventy-seven million, four hundred forty-five thousand, sixty-one".