1621308113 has 4 divisors (see below), whose sum is σ = 1621518948. Its totient is φ = 1621097280.

The previous prime is 1621308109. The next prime is 1621308119. The reversal of 1621308113 is 3118031261.

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 476636224 + 1144671889 = 21832^2 + 33833^2 .

It is a cyclic number.

It is not a de Polignac number, because 1621308113 - 2² = 1621308109 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1621308119) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 93428 + ... + 109413.

It is an arithmetic number, because the mean of its divisors is an integer number (405379737).

Almost surely, 2^1621308113 is an apocalyptic number.

It is an amenable number.

1621308113 is a deficient number, since it is larger than the sum of its proper divisors (210835).

1621308113 is an equidigital number, since it uses as much as digits as its factorization.

1621308113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 210834.

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 1621308113 is about 40265.4704803011. The cubic root of 1621308113 is about 1174.7763239238.

Adding to 1621308113 its reverse (3118031261), we get a palindrome (4739339374).

The spelling of 1621308113 in words is "one billion, six hundred twenty-one million, three hundred eight thousand, one hundred thirteen".