215253461 has 4 divisors (see below), whose sum is σ = 215932812. Its totient is φ = 214574112.

The previous prime is 215253427. The next prime is 215253463. The reversal of 215253461 is 164352512.

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

It can be written as a sum of positive squares in 2 ways, for example, as 4452100 + 210801361 = 2110^2 + 14519^2 .

It is a cyclic number.

It is not a de Polignac number, because 215253461 - 2⁶ = 215253397 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215253463) 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, 339200 + ... + 339833.

It is an arithmetic number, because the mean of its divisors is an integer number (53983203).

Almost surely, 2^215253461 is an apocalyptic number.

It is an amenable number.

215253461 is a deficient number, since it is larger than the sum of its proper divisors (679351).

215253461 is an equidigital number, since it uses as much as digits as its factorization.

215253461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 679350.

The product of its digits is 7200, while the sum is 29.

The square root of 215253461 is about 14671.5187012115. The cubic root of 215253461 is about 599.3079622984.

The spelling of 215253461 in words is "two hundred fifteen million, two hundred fifty-three thousand, four hundred sixty-one".