216124477 has 2 divisors, whose sum is σ = 216124478. Its totient is φ = 216124476.

The previous prime is 216124429. The next prime is 216124481. The reversal of 216124477 is 774421612.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 212168356 + 3956121 = 14566^2 + 1989^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-216124477 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216124427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108062238 + 108062239.

It is an arithmetic number, because the mean of its divisors is an integer number (108062239).

Almost surely, 2^216124477 is an apocalyptic number.

It is an amenable number.

216124477 is a deficient number, since it is larger than the sum of its proper divisors (1).

216124477 is an equidigital number, since it uses as much as digits as its factorization.

216124477 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18816, while the sum is 34.

The square root of 216124477 is about 14701.1726403032. The cubic root of 216124477 is about 600.1152343485.

The spelling of 216124477 in words is "two hundred sixteen million, one hundred twenty-four thousand, four hundred seventy-seven".