1621312323 has 8 divisors (see below), whose sum is σ = 2214475536. Its totient is φ = 1054512000.

The previous prime is 1621312279. The next prime is 1621312327. The reversal of 1621312323 is 3232131261.

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

It is not a de Polignac number, because 1621312323 - 2¹⁶ = 1621246787 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1621312293 and 1621312302.

It is not an unprimeable number, because it can be changed into a prime (1621312327) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6590578 + ... + 6590823.

It is an arithmetic number, because the mean of its divisors is an integer number (276809442).

Almost surely, 2^1621312323 is an apocalyptic number.

1621312323 is a deficient number, since it is larger than the sum of its proper divisors (593163213).

1621312323 is a wasteful number, since it uses less digits than its factorization.

1621312323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13181445.

The product of its digits is 1296, while the sum is 24.

The square root of 1621312323 is about 40265.5227583102. The cubic root of 1621312323 is about 1174.7773407579. Note that the first 3 decimals are identical.

Adding to 1621312323 its reverse (3232131261), we get a palindrome (4853443584).

The spelling of 1621312323 in words is "one billion, six hundred twenty-one million, three hundred twelve thousand, three hundred twenty-three".