1155281 has 8 divisors (see below), whose sum is σ = 1202784. Its totient is φ = 1108800.

The previous prime is 1155263. The next prime is 1155293. The reversal of 1155281 is 1825511.

1155281 = 23² + 24² + ... + 151².

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1155281 is a prime.

It is a super-2 number, since 2×1155281² = 2669348377922, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1155211) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2681 + ... + 3081.

It is an arithmetic number, because the mean of its divisors is an integer number (150348).

2^1155281 is an apocalyptic number.

It is an amenable number.

1155281 is a deficient number, since it is larger than the sum of its proper divisors (47503).

1155281 is an equidigital number, since it uses as much as digits as its factorization.

1155281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 511.

The product of its digits is 400, while the sum is 23.

The square root of 1155281 is about 1074.8399880913. The cubic root of 1155281 is about 104.9290828767.

The spelling of 1155281 in words is "one million, one hundred fifty-five thousand, two hundred eighty-one".