215307381 has 8 divisors (see below), whose sum is σ = 291361504. Its totient is φ = 141395760.

The previous prime is 215307371. The next prime is 215307383. The reversal of 215307381 is 183703512.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 215307381 - 2⁵ = 215307349 is a prime.

It is a super-2 number, since 2×215307381² = 92714536626158322, 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 (215307383) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 535390 + ... + 535791.

It is an arithmetic number, because the mean of its divisors is an integer number (36420188).

Almost surely, 2^215307381 is an apocalyptic number.

It is an amenable number.

215307381 is a deficient number, since it is larger than the sum of its proper divisors (76054123).

215307381 is a wasteful number, since it uses less digits than its factorization.

215307381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1071251.

The product of its (nonzero) digits is 5040, while the sum is 30.

The square root of 215307381 is about 14673.3561600610. The cubic root of 215307381 is about 599.3579994149.

The spelling of 215307381 in words is "two hundred fifteen million, three hundred seven thousand, three hundred eighty-one".