281381132 has 6 divisors (see below), whose sum is σ = 492416988. Its totient is φ = 140690564.

The previous prime is 281381123. The next prime is 281381137. The reversal of 281381132 is 231183182.

It is a junction number, because it is equal to n+sod(n) for n = 281381095 and 281381104.

It is not an unprimeable number, because it can be changed into a prime (281381137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35172638 + ... + 35172645.

It is an arithmetic number, because the mean of its divisors is an integer number (82069498).

Almost surely, 2^281381132 is an apocalyptic number.

It is an amenable number.

281381132 is a deficient number, since it is larger than the sum of its proper divisors (211035856).

281381132 is a wasteful number, since it uses less digits than its factorization.

281381132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70345287 (or 70345285 counting only the distinct ones).

The product of its digits is 2304, while the sum is 29.

The square root of 281381132 is about 16774.4189765249. The cubic root of 281381132 is about 655.2871588229.

The spelling of 281381132 in words is "two hundred eighty-one million, three hundred eighty-one thousand, one hundred thirty-two".