216474761 has 2 divisors, whose sum is σ = 216474762. Its totient is φ = 216474760.

The previous prime is 216474757. The next prime is 216474833. The reversal of 216474761 is 167474612.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 128958736 + 87516025 = 11356^2 + 9355^2 .

It is a cyclic number.

It is not a de Polignac number, because 216474761 - 2² = 216474757 is a prime.

It is a super-2 number, since 2×216474761² = 93722644300014242, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (216474701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108237380 + 108237381.

It is an arithmetic number, because the mean of its divisors is an integer number (108237381).

Almost surely, 2^216474761 is an apocalyptic number.

It is an amenable number.

216474761 is a deficient number, since it is larger than the sum of its proper divisors (1).

216474761 is an equidigital number, since it uses as much as digits as its factorization.

216474761 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 56448, while the sum is 38.

The square root of 216474761 is about 14713.0812884317. The cubic root of 216474761 is about 600.4392718405.

The spelling of 216474761 in words is "two hundred sixteen million, four hundred seventy-four thousand, seven hundred sixty-one".