281006402 has 4 divisors (see below), whose sum is σ = 421509606. Its totient is φ = 140503200.

The previous prime is 281006399. The next prime is 281006417. The reversal of 281006402 is 204600182.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 204600182 = 2 ⋅102300091.

It can be written as a sum of positive squares in only one way, i.e., 204461401 + 76545001 = 14299^2 + 8749^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 70251599 + ... + 70251602.

Almost surely, 2^281006402 is an apocalyptic number.

281006402 is a deficient number, since it is larger than the sum of its proper divisors (140503204).

281006402 is a wasteful number, since it uses less digits than its factorization.

281006402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140503203.

The product of its (nonzero) digits is 768, while the sum is 23.

The square root of 281006402 is about 16763.2455688032. The cubic root of 281006402 is about 654.9961361775.

Adding to 281006402 its reverse (204600182), we get a palindrome (485606584).

The spelling of 281006402 in words is "two hundred eighty-one million, six thousand, four hundred two".