1621323263 has 8 divisors (see below), whose sum is σ = 1856156832. Its totient is φ = 1387293696.

The previous prime is 1621323259. The next prime is 1621323287. The reversal of 1621323263 is 3623231261.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1621323263 - 2² = 1621323259 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 (1621323293) 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 7 ways as a sum of consecutive naturals, for example, 196670 + ... + 204747.

It is an arithmetic number, because the mean of its divisors is an integer number (232019604).

Almost surely, 2^1621323263 is an apocalyptic number.

1621323263 is a deficient number, since it is larger than the sum of its proper divisors (234833569).

1621323263 is an equidigital number, since it uses as much as digits as its factorization.

1621323263 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 402001.

The product of its digits is 7776, while the sum is 29.

The square root of 1621323263 is about 40265.6586063112. The cubic root of 1621323263 is about 1174.7799830691.

The spelling of 1621323263 in words is "one billion, six hundred twenty-one million, three hundred twenty-three thousand, two hundred sixty-three".