281081973 has 4 divisors (see below), whose sum is σ = 374775968. Its totient is φ = 187387980.

The previous prime is 281081917. The next prime is 281081989. The reversal of 281081973 is 379180182.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 281081973 - 2⁶ = 281081909 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (281083973) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46846993 + ... + 46846998.

It is an arithmetic number, because the mean of its divisors is an integer number (93693992).

Almost surely, 2^281081973 is an apocalyptic number.

It is an amenable number.

281081973 is a deficient number, since it is larger than the sum of its proper divisors (93693995).

281081973 is an equidigital number, since it uses as much as digits as its factorization.

281081973 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93693994.

The product of its (nonzero) digits is 24192, while the sum is 39.

The square root of 281081973 is about 16765.4994855507. The cubic root of 281081973 is about 655.0548469116.

It can be divided in two parts, 28108197 and 3, that multiplied together give a triangular number (84324591 = T₁₂₉₈₆).

The spelling of 281081973 in words is "two hundred eighty-one million, eighty-one thousand, nine hundred seventy-three".