216736257 has 4 divisors (see below), whose sum is σ = 288981680. Its totient is φ = 144490836.

The previous prime is 216736237. The next prime is 216736277. The reversal of 216736257 is 752637612.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (216736237) and next prime (216736277).

It is not a de Polignac number, because 216736257 - 2¹² = 216732161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216736207) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36122707 + ... + 36122712.

It is an arithmetic number, because the mean of its divisors is an integer number (72245420).

Almost surely, 2^216736257 is an apocalyptic number.

It is an amenable number.

216736257 is a deficient number, since it is larger than the sum of its proper divisors (72245423).

216736257 is an equidigital number, since it uses as much as digits as its factorization.

216736257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72245422.

The product of its digits is 105840, while the sum is 39.

The square root of 216736257 is about 14721.9651201869. The cubic root of 216736257 is about 600.6809463389.

The spelling of 216736257 in words is "two hundred sixteen million, seven hundred thirty-six thousand, two hundred fifty-seven".