215412381 has 12 divisors (see below), whose sum is σ = 315090880. Its totient is φ = 141789960.

The previous prime is 215412371. The next prime is 215412391. The reversal of 215412381 is 183214512.

215412381 is a `hidden beast` number, since 21 + 541 + 23 + 81 = 666.

It is an interprime number because it is at equal distance from previous prime (215412371) and next prime (215412391).

It is not a de Polignac number, because 215412381 - 2⁹ = 215411869 is a prime.

It is a super-2 number, since 2×215412381² = 92804987776178322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215412311) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 150775 + ... + 152196.

Almost surely, 2^215412381 is an apocalyptic number.

It is an amenable number.

215412381 is a deficient number, since it is larger than the sum of its proper divisors (99678499).

215412381 is a wasteful number, since it uses less digits than its factorization.

215412381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 303056 (or 303053 counting only the distinct ones).

The product of its digits is 1920, while the sum is 27.

The square root of 215412381 is about 14676.9336375143. The cubic root of 215412381 is about 599.4554141934.

Adding to 215412381 its reverse (183214512), we get a palindrome (398626893).

It can be divided in two parts, 2154 and 12381, that added together give a triangular number (14535 = T₁₇₀).

The spelling of 215412381 in words is "two hundred fifteen million, four hundred twelve thousand, three hundred eighty-one".