281972155 has 8 divisors (see below), whose sum is σ = 338479632. Its totient is φ = 225502368.

The previous prime is 281972143. The next prime is 281972161. The reversal of 281972155 is 551279182.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 281972155 - 2⁵ = 281972123 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11112 + ... + 26218.

It is an arithmetic number, because the mean of its divisors is an integer number (42309954).

Almost surely, 2^281972155 is an apocalyptic number.

281972155 is a deficient number, since it is larger than the sum of its proper divisors (56507477).

281972155 is a wasteful number, since it uses less digits than its factorization.

281972155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18845.

The product of its digits is 50400, while the sum is 40.

The square root of 281972155 is about 16792.0265304698. The cubic root of 281972155 is about 655.7456341734.

The spelling of 281972155 in words is "two hundred eighty-one million, nine hundred seventy-two thousand, one hundred fifty-five".