1613281 has 4 divisors (see below), whose sum is σ = 1626112. Its totient is φ = 1600452.

The previous prime is 1613279. The next prime is 1613321. The reversal of 1613281 is 1823161.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1823161 = 677 ⋅2693.

It is a cyclic number.

It is not a de Polignac number, because 1613281 - 2¹ = 1613279 is a prime.

It is a super-2 number, since 2×1613281² = 5205351169922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1613201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6225 + ... + 6478.

It is an arithmetic number, because the mean of its divisors is an integer number (406528).

2^1613281 is an apocalyptic number.

It is an amenable number.

1613281 is a deficient number, since it is larger than the sum of its proper divisors (12831).

1613281 is a wasteful number, since it uses less digits than its factorization.

1613281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12830.

The product of its digits is 288, while the sum is 22.

The square root of 1613281 is about 1270.1499911428. The cubic root of 1613281 is about 117.2834338940.

The spelling of 1613281 in words is "one million, six hundred thirteen thousand, two hundred eighty-one".