215274481 has 2 divisors, whose sum is σ = 215274482. Its totient is φ = 215274480.

The previous prime is 215274467. The next prime is 215274497. The reversal of 215274481 is 184472512.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 160883856 + 54390625 = 12684^2 + 7375^2 .

It is a cyclic number.

It is not a de Polignac number, because 215274481 - 2²¹ = 213177329 is a prime.

It is a super-2 number, since 2×215274481² = 92686204339638722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (215274401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107637240 + 107637241.

It is an arithmetic number, because the mean of its divisors is an integer number (107637241).

Almost surely, 2^215274481 is an apocalyptic number.

It is an amenable number.

215274481 is a deficient number, since it is larger than the sum of its proper divisors (1).

215274481 is an equidigital number, since it uses as much as digits as its factorization.

215274481 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17920, while the sum is 34.

The square root of 215274481 is about 14672.2350376485. The cubic root of 215274481 is about 599.3274696012.

The spelling of 215274481 in words is "two hundred fifteen million, two hundred seventy-four thousand, four hundred eighty-one".