281166442 has 4 divisors (see below), whose sum is σ = 421749666. Its totient is φ = 140583220.

The previous prime is 281166439. The next prime is 281166463. The reversal of 281166442 is 244661182.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 258212761 + 22953681 = 16069^2 + 4791^2 .

It is a junction number, because it is equal to n+sod(n) for n = 281166398 and 281166407.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 70291609 + ... + 70291612.

Almost surely, 2^281166442 is an apocalyptic number.

281166442 is a deficient number, since it is larger than the sum of its proper divisors (140583224).

281166442 is a wasteful number, since it uses less digits than its factorization.

281166442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140583223.

The product of its digits is 18432, while the sum is 34.

The square root of 281166442 is about 16768.0184279479. The cubic root of 281166442 is about 655.1204580043.

The spelling of 281166442 in words is "two hundred eighty-one million, one hundred sixty-six thousand, four hundred forty-two".