1531281 has 8 divisors (see below), whose sum is σ = 2052864. Its totient is φ = 1015280.

The previous prime is 1531279. The next prime is 1531297. The reversal of 1531281 is 1821351.

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 1531281 - 2¹ = 1531279 is a prime.

It is a super-2 number, since 2×1531281² = 4689643001922, which contains 22 as substring.

1531281 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1531081) 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, 705 + ... + 1886.

It is an arithmetic number, because the mean of its divisors is an integer number (256608).

2^1531281 is an apocalyptic number.

It is an amenable number.

1531281 is a deficient number, since it is larger than the sum of its proper divisors (521583).

1531281 is a wasteful number, since it uses less digits than its factorization.

1531281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2791.

The product of its digits is 240, while the sum is 21.

The square root of 1531281 is about 1237.4493929046. The cubic root of 1531281 is about 115.2616851113.

The spelling of 1531281 in words is "one million, five hundred thirty-one thousand, two hundred eighty-one".