215928469 has 2 divisors, whose sum is σ = 215928470. Its totient is φ = 215928468.

The previous prime is 215928467. The next prime is 215928491. The reversal of 215928469 is 964829512.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 130827844 + 85100625 = 11438^2 + 9225^2 .

It is a cyclic number.

It is not a de Polignac number, because 215928469 - 2¹ = 215928467 is a prime.

It is a super-2 number, since 2×215928469² = 93250207449367922, which contains 22 as substring.

Together with 215928467, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (215928467) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107964234 + 107964235.

It is an arithmetic number, because the mean of its divisors is an integer number (107964235).

Almost surely, 2^215928469 is an apocalyptic number.

It is an amenable number.

215928469 is a deficient number, since it is larger than the sum of its proper divisors (1).

215928469 is an equidigital number, since it uses as much as digits as its factorization.

215928469 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 311040, while the sum is 46.

The square root of 215928469 is about 14694.5047211534. The cubic root of 215928469 is about 599.9337602800.

It can be divided in two parts, 2159 and 28469, that added together give a triangular number (30628 = T₂₄₇).

The spelling of 215928469 in words is "two hundred fifteen million, nine hundred twenty-eight thousand, four hundred sixty-nine".