1620834013 has 4 divisors (see below), whose sum is σ = 1637543740. Its totient is φ = 1604124288.

The previous prime is 1620834001. The next prime is 1620834023. The reversal of 1620834013 is 3104380261.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3104380261 = 73 ⋅42525757.

It can be written as a sum of positive squares in 2 ways, for example, as 742126564 + 878707449 = 27242^2 + 29643^2 .

It is a cyclic number.

It is not a de Polignac number, because 1620834013 - 2²⁵ = 1587279581 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1620834023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8354718 + ... + 8354911.

It is an arithmetic number, because the mean of its divisors is an integer number (409385935).

Almost surely, 2^1620834013 is an apocalyptic number.

It is an amenable number.

1620834013 is a deficient number, since it is larger than the sum of its proper divisors (16709727).

1620834013 is an equidigital number, since it uses as much as digits as its factorization.

1620834013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16709726.

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 1620834013 is about 40259.5828716593. The cubic root of 1620834013 is about 1174.6618041012.

The spelling of 1620834013 in words is "one billion, six hundred twenty million, eight hundred thirty-four thousand, thirteen".