216131577 has 8 divisors (see below), whose sum is σ = 298112640. Its totient is φ = 139119120.

The previous prime is 216131569. The next prime is 216131579. The reversal of 216131577 is 775131612.

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

It is not a de Polignac number, because 216131577 - 2³ = 216131569 is a prime.

It is not an unprimeable number, because it can be changed into a prime (216131579) 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, 1242049 + ... + 1242222.

It is an arithmetic number, because the mean of its divisors is an integer number (37264080).

Almost surely, 2^216131577 is an apocalyptic number.

It is an amenable number.

216131577 is a deficient number, since it is larger than the sum of its proper divisors (81981063).

216131577 is a wasteful number, since it uses less digits than its factorization.

216131577 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2484303.

The product of its digits is 8820, while the sum is 33.

The square root of 216131577 is about 14701.4141156557. The cubic root of 216131577 is about 600.1218058261.

The spelling of 216131577 in words is "two hundred sixteen million, one hundred thirty-one thousand, five hundred seventy-seven".