215196769 has 4 divisors (see below), whose sum is σ = 215312580. Its totient is φ = 215080960.

The previous prime is 215196757. The next prime is 215196781. The reversal of 215196769 is 967691512.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (215196757) and next prime (215196781).

It can be written as a sum of positive squares in 2 ways, for example, as 81216144 + 133980625 = 9012^2 + 11575^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-215196769 is a prime.

It is a super-2 number, since 2×215196769² = 92619298776078722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (215196719) 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 in 3 ways as a sum of consecutive naturals, for example, 55072 + ... + 58849.

It is an arithmetic number, because the mean of its divisors is an integer number (53828145).

Almost surely, 2^215196769 is an apocalyptic number.

It is an amenable number.

215196769 is a deficient number, since it is larger than the sum of its proper divisors (115811).

215196769 is a wasteful number, since it uses less digits than its factorization.

215196769 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115810.

The product of its digits is 204120, while the sum is 46.

The square root of 215196769 is about 14669.5865313239. The cubic root of 215196769 is about 599.2553437868.

The spelling of 215196769 in words is "two hundred fifteen million, one hundred ninety-six thousand, seven hundred sixty-nine".