2178132981 has 8 divisors (see below), whose sum is σ = 2931319584. Its totient is φ = 1438517520.

The previous prime is 2178132947. The next prime is 2178132991. The reversal of 2178132981 is 1892318712.

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

It is not a de Polignac number, because 2178132981 - 2²² = 2173938677 is a prime.

It is a super-2 number, since 2×2178132981² = 9488526565839892722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2178132991) 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, 3392410 + ... + 3393051.

It is an arithmetic number, because the mean of its divisors is an integer number (366414948).

Almost surely, 2^2178132981 is an apocalyptic number.

It is an amenable number.

2178132981 is a deficient number, since it is larger than the sum of its proper divisors (753186603).

2178132981 is a wasteful number, since it uses less digits than its factorization.

2178132981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6785571.

The product of its digits is 48384, while the sum is 42.

The square root of 2178132981 is about 46670.4722603061. The cubic root of 2178132981 is about 1296.2679909670.

The spelling of 2178132981 in words is "two billion, one hundred seventy-eight million, one hundred thirty-two thousand, nine hundred eighty-one".