77961061 has 2 divisors, whose sum is σ = 77961062. Its totient is φ = 77961060.

The previous prime is 77961029. The next prime is 77961089. The reversal of 77961061 is 16016977.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 65044225 + 12916836 = 8065^2 + 3594^2 .

It is a cyclic number.

It is not a de Polignac number, because 77961061 - 2⁵ = 77961029 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 77961061.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77961461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38980530 + 38980531.

It is an arithmetic number, because the mean of its divisors is an integer number (38980531).

Almost surely, 2^77961061 is an apocalyptic number.

It is an amenable number.

77961061 is a deficient number, since it is larger than the sum of its proper divisors (1).

77961061 is an equidigital number, since it uses as much as digits as its factorization.

77961061 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15876, while the sum is 37.

The square root of 77961061 is about 8829.5561043577. The cubic root of 77961061 is about 427.1947567384.

The spelling of 77961061 in words is "seventy-seven million, nine hundred sixty-one thousand, sixty-one".