1491281 has 4 divisors (see below), whose sum is σ = 1626864. Its totient is φ = 1355700.

The previous prime is 1491271. The next prime is 1491299. The reversal of 1491281 is 1821941.

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 a cyclic number.

It is not a de Polignac number, because 1491281 - 2¹⁰ = 1490257 is a prime.

It is a super-2 number, since 2×1491281² = 4447838041922, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1491281.

It is not an unprimeable number, because it can be changed into a prime (1491241) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 67775 + ... + 67796.

It is an arithmetic number, because the mean of its divisors is an integer number (406716).

2^1491281 is an apocalyptic number.

1491281 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1491281 is a deficient number, since it is larger than the sum of its proper divisors (135583).

1491281 is a wasteful number, since it uses less digits than its factorization.

1491281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135582.

The product of its digits is 576, while the sum is 26.

The square root of 1491281 is about 1221.1801668878. The cubic root of 1491281 is about 114.2491983785.

The spelling of 1491281 in words is "one million, four hundred ninety-one thousand, two hundred eighty-one".