77441261 has 2 divisors, whose sum is σ = 77441262. Its totient is φ = 77441260.

The previous prime is 77441249. The next prime is 77441263. The reversal of 77441261 is 16214477.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 63520900 + 13920361 = 7970^2 + 3731^2 .

It is a cyclic number.

It is not a de Polignac number, because 77441261 - 2⁶ = 77441197 is a prime.

It is a Sophie Germain prime.

Together with 77441263, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77441263) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38720630 + 38720631.

It is an arithmetic number, because the mean of its divisors is an integer number (38720631).

Almost surely, 2^77441261 is an apocalyptic number.

It is an amenable number.

77441261 is a deficient number, since it is larger than the sum of its proper divisors (1).

77441261 is an equidigital number, since it uses as much as digits as its factorization.

77441261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9408, while the sum is 32.

The square root of 77441261 is about 8800.0716474356. The cubic root of 77441261 is about 426.2432082692.

The spelling of 77441261 in words is "seventy-seven million, four hundred forty-one thousand, two hundred sixty-one".