291128 has 16 divisors (see below), whose sum is σ = 551760. Its totient is φ = 144000.

The previous prime is 291113. The next prime is 291143. The reversal of 291128 is 821192.

It is an interprime number because it is at equal distance from previous prime (291113) and next prime (291143).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1088 + ... + 1328.

It is an arithmetic number, because the mean of its divisors is an integer number (34485).

2²⁹¹¹²⁸ is an apocalyptic number.

It is an amenable number.

291128 is a deficient number, since it is larger than the sum of its proper divisors (260632).

291128 is a wasteful number, since it uses less digits than its factorization.

291128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 398 (or 394 counting only the distinct ones).

The product of its digits is 288, while the sum is 23.

The square root of 291128 is about 539.5627859666. The cubic root of 291128 is about 66.2767685821.

The spelling of 291128 in words is "two hundred ninety-one thousand, one hundred twenty-eight".