77217461 has 2 divisors, whose sum is σ = 77217462. Its totient is φ = 77217460.

The previous prime is 77217457. The next prime is 77217493. The reversal of 77217461 is 16471277.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 55965361 + 21252100 = 7481^2 + 4610^2 .

It is an emirp because it is prime and its reverse (16471277) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 77217461 - 2² = 77217457 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77217421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38608730 + 38608731.

It is an arithmetic number, because the mean of its divisors is an integer number (38608731).

Almost surely, 2^77217461 is an apocalyptic number.

It is an amenable number.

77217461 is a deficient number, since it is larger than the sum of its proper divisors (1).

77217461 is an equidigital number, since it uses as much as digits as its factorization.

77217461 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16464, while the sum is 35.

The square root of 77217461 is about 8787.3466416206. The cubic root of 77217461 is about 425.8322074241.

The spelling of 77217461 in words is "seventy-seven million, two hundred seventeen thousand, four hundred sixty-one".