1621183423 has 2 divisors, whose sum is σ = 1621183424. Its totient is φ = 1621183422.

The previous prime is 1621183391. The next prime is 1621183441. The reversal of 1621183423 is 3243811261.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1621183423 - 2⁵ = 1621183391 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1621183483) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 810591711 + 810591712.

It is an arithmetic number, because the mean of its divisors is an integer number (810591712).

Almost surely, 2^1621183423 is an apocalyptic number.

1621183423 is a deficient number, since it is larger than the sum of its proper divisors (1).

1621183423 is an equidigital number, since it uses as much as digits as its factorization.

1621183423 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6912, while the sum is 31.

The square root of 1621183423 is about 40263.9221015539. The cubic root of 1621183423 is about 1174.7462069637.

Adding to 1621183423 its reverse (3243811261), we get a palindrome (4864994684).

The spelling of 1621183423 in words is "one billion, six hundred twenty-one million, one hundred eighty-three thousand, four hundred twenty-three".