1621622123 has 8 divisors (see below), whose sum is σ = 1771191360. Its totient is φ = 1472411080.

The previous prime is 1621622111. The next prime is 1621622131. The reversal of 1621622123 is 3212261261.

It is a happy number.

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 1621622123 - 2³⁰ = 547880299 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1621622092 and 1621622101.

It is not an unprimeable number, because it can be changed into a prime (1621622173) 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, 80033 + ... + 98226.

It is an arithmetic number, because the mean of its divisors is an integer number (221398920).

Almost surely, 2^1621622123 is an apocalyptic number.

1621622123 is a deficient number, since it is larger than the sum of its proper divisors (149569237).

1621622123 is a wasteful number, since it uses less digits than its factorization.

1621622123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 179097.

The product of its digits is 1728, while the sum is 26.

The square root of 1621622123 is about 40269.3695381490. The cubic root of 1621622123 is about 1174.8521613907.

Adding to 1621622123 its reverse (3212261261), we get a palindrome (4833883384).

The spelling of 1621622123 in words is "one billion, six hundred twenty-one million, six hundred twenty-two thousand, one hundred twenty-three".