215473381 has 2 divisors, whose sum is σ = 215473382. Its totient is φ = 215473380.

The previous prime is 215473373. The next prime is 215473397. The reversal of 215473381 is 183374512.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 203632900 + 11840481 = 14270^2 + 3441^2 .

It is a cyclic number.

It is not a de Polignac number, because 215473381 - 2³ = 215473373 is a prime.

It is a super-2 number, since 2×215473381² = 92857555839142322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (215473331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107736690 + 107736691.

It is an arithmetic number, because the mean of its divisors is an integer number (107736691).

Almost surely, 2^215473381 is an apocalyptic number.

It is an amenable number.

215473381 is a deficient number, since it is larger than the sum of its proper divisors (1).

215473381 is an equidigital number, since it uses as much as digits as its factorization.

215473381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20160, while the sum is 34.

The square root of 215473381 is about 14679.0115811658. The cubic root of 215473381 is about 599.5119930044.

The spelling of 215473381 in words is "two hundred fifteen million, four hundred seventy-three thousand, three hundred eighty-one".