77984461 has 2 divisors, whose sum is σ = 77984462. Its totient is φ = 77984460.

The previous prime is 77984443. The next prime is 77984471. The reversal of 77984461 is 16448977.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 76212900 + 1771561 = 8730^2 + 1331^2 .

It is an emirp because it is prime and its reverse (16448977) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 77984461 - 2⁹ = 77983949 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77984441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38992230 + 38992231.

It is an arithmetic number, because the mean of its divisors is an integer number (38992231).

Almost surely, 2^77984461 is an apocalyptic number.

It is an amenable number.

77984461 is a deficient number, since it is larger than the sum of its proper divisors (1).

77984461 is an equidigital number, since it uses as much as digits as its factorization.

77984461 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 338688, while the sum is 46.

The square root of 77984461 is about 8830.8810998677. The cubic root of 77984461 is about 427.2374932755.

The spelling of 77984461 in words is "seventy-seven million, nine hundred eighty-four thousand, four hundred sixty-one".