215470081 has 4 divisors (see below), whose sum is σ = 215516164. Its totient is φ = 215424000.

The previous prime is 215470061. The next prime is 215470091. The reversal of 215470081 is 180074512.

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 126337600 + 89132481 = 11240^2 + 9441^2 .

It is a cyclic number.

It is not a de Polignac number, because 215470081 - 2⁷ = 215469953 is a prime.

It is a super-2 number, since 2×215470081² = 92854711612293122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (215470061) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15120 + ... + 25681.

It is an arithmetic number, because the mean of its divisors is an integer number (53879041).

Almost surely, 2^215470081 is an apocalyptic number.

It is an amenable number.

215470081 is a deficient number, since it is larger than the sum of its proper divisors (46083).

215470081 is an equidigital number, since it uses as much as digits as its factorization.

215470081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46082.

The product of its (nonzero) digits is 2240, while the sum is 28.

The square root of 215470081 is about 14678.8991753469. The cubic root of 215470081 is about 599.5089324567.

The spelling of 215470081 in words is "two hundred fifteen million, four hundred seventy thousand, eighty-one".