1613210881 has 4 divisors (see below), whose sum is σ = 1620255700. Its totient is φ = 1606166064.

The previous prime is 1613210843. The next prime is 1613210899. The reversal of 1613210881 is 1880123161.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 965966400 + 647244481 = 31080^2 + 25441^2 .

It is a cyclic number.

It is not a de Polignac number, because 1613210881 - 2⁹ = 1613210369 is a prime.

It is a super-2 number, since 2×1613210881² = 5204898693153592322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1613210831) 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, 3522066 + ... + 3522523.

It is an arithmetic number, because the mean of its divisors is an integer number (405063925).

Almost surely, 2^1613210881 is an apocalyptic number.

It is an amenable number.

1613210881 is a deficient number, since it is larger than the sum of its proper divisors (7044819).

1613210881 is an equidigital number, since it uses as much as digits as its factorization.

1613210881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7044818.

The product of its (nonzero) digits is 2304, while the sum is 31.

The square root of 1613210881 is about 40164.7965387602. The cubic root of 1613210881 is about 1172.8173468264.

The spelling of 1613210881 in words is "one billion, six hundred thirteen million, two hundred ten thousand, eight hundred eighty-one".