1623132989 has 4 divisors (see below), whose sum is σ = 1625014656. Its totient is φ = 1621251324.

The previous prime is 1623132859. The next prime is 1623132991. The reversal of 1623132989 is 9892313261.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 9892313261 = 36389 ⋅271849.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1623132989 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 (1623132089) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 939539 + ... + 941264.

It is an arithmetic number, because the mean of its divisors is an integer number (406253664).

Almost surely, 2^1623132989 is an apocalyptic number.

It is an amenable number.

1623132989 is a deficient number, since it is larger than the sum of its proper divisors (1881667).

1623132989 is an equidigital number, since it uses as much as digits as its factorization.

1623132989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1881666.

The product of its digits is 139968, while the sum is 44.

The square root of 1623132989 is about 40288.1246647198. The cubic root of 1623132989 is about 1175.2169182137.

The spelling of 1623132989 in words is "one billion, six hundred twenty-three million, one hundred thirty-two thousand, nine hundred eighty-nine".