281725042 has 4 divisors (see below), whose sum is σ = 422587566. Its totient is φ = 140862520.

The previous prime is 281725033. The next prime is 281725099. The reversal of 281725042 is 240527182.

It is a happy number.

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., 258598561 + 23126481 = 16081^2 + 4809^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 281724995 and 281725013.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 70431259 + ... + 70431262.

Almost surely, 2^281725042 is an apocalyptic number.

281725042 is a deficient number, since it is larger than the sum of its proper divisors (140862524).

281725042 is a wasteful number, since it uses less digits than its factorization.

281725042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140862523.

The product of its (nonzero) digits is 8960, while the sum is 31.

The square root of 281725042 is about 16784.6668718804. Note that the first 3 decimals coincide. The cubic root of 281725042 is about 655.5540187628.

The spelling of 281725042 in words is "two hundred eighty-one million, seven hundred twenty-five thousand, forty-two".