215741139 has 32 divisors (see below), whose sum is σ = 305980416. Its totient is φ = 135041280.

The previous prime is 215741137. The next prime is 215741147. The reversal of 215741139 is 931147512.

It is not a de Polignac number, because 215741139 - 2¹ = 215741137 is a prime.

It is not an unprimeable number, because it can be changed into a prime (215741137) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 387049 + ... + 387605.

It is an arithmetic number, because the mean of its divisors is an integer number (9561888).

Almost surely, 2^215741139 is an apocalyptic number.

215741139 is a deficient number, since it is larger than the sum of its proper divisors (90239277).

215741139 is a wasteful number, since it uses less digits than its factorization.

215741139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 715.

The product of its digits is 7560, while the sum is 33.

The square root of 215741139 is about 14688.1291865234. The cubic root of 215741139 is about 599.7602180760.

The spelling of 215741139 in words is "two hundred fifteen million, seven hundred forty-one thousand, one hundred thirty-nine".