281006401 has 16 divisors (see below), whose sum is σ = 306432000. Its totient is φ = 256148928.

The previous prime is 281006399. The next prime is 281006417. The reversal of 281006401 is 104600182.

It is a cyclic number.

It is not a de Polignac number, because 281006401 - 2¹ = 281006399 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (281006441) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 462640 + ... + 463246.

It is an arithmetic number, because the mean of its divisors is an integer number (19152000).

Almost surely, 2^281006401 is an apocalyptic number.

It is an amenable number.

281006401 is a deficient number, since it is larger than the sum of its proper divisors (25425599).

281006401 is a wasteful number, since it uses less digits than its factorization.

281006401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1008.

The product of its (nonzero) digits is 384, while the sum is 22.

The square root of 281006401 is about 16763.2455389760. The cubic root of 281006401 is about 654.9961354005.

Adding to 281006401 its reverse (104600182), we get a palindrome (385606583).

The spelling of 281006401 in words is "two hundred eighty-one million, six thousand, four hundred one".