77214409 has 2 divisors, whose sum is σ = 77214410. Its totient is φ = 77214408.

The previous prime is 77214407. The next prime is 77214437. The reversal of 77214409 is 90441277.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 68641225 + 8573184 = 8285^2 + 2928^2 .

It is a cyclic number.

It is not a de Polignac number, because 77214409 - 2¹ = 77214407 is a prime.

Together with 77214407, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (77214407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38607204 + 38607205.

It is an arithmetic number, because the mean of its divisors is an integer number (38607205).

Almost surely, 2^77214409 is an apocalyptic number.

It is an amenable number.

77214409 is a deficient number, since it is larger than the sum of its proper divisors (1).

77214409 is an equidigital number, since it uses as much as digits as its factorization.

77214409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14112, while the sum is 34.

The square root of 77214409 is about 8787.1729811129. The cubic root of 77214409 is about 425.8265970478.

The spelling of 77214409 in words is "seventy-seven million, two hundred fourteen thousand, four hundred nine".