981323129 has 4 divisors (see below), whose sum is σ = 1023989376. Its totient is φ = 938656884.

The previous prime is 981323117. The next prime is 981323137. The reversal of 981323129 is 921323189.

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: 921323189 = 1907 ⋅483127.

It is a cyclic number.

It is not a de Polignac number, because 981323129 - 2²⁴ = 964545913 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 981323092 and 981323101.

It is not an unprimeable number, because it can be changed into a prime (981323149) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21333089 + ... + 21333134.

It is an arithmetic number, because the mean of its divisors is an integer number (255997344).

Almost surely, 2^981323129 is an apocalyptic number.

It is an amenable number.

981323129 is a deficient number, since it is larger than the sum of its proper divisors (42666247).

981323129 is a wasteful number, since it uses less digits than its factorization.

981323129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42666246.

The product of its digits is 23328, while the sum is 38.

The square root of 981323129 is about 31326.0774595224. The cubic root of 981323129 is about 993.7352107077.

The spelling of 981323129 in words is "nine hundred eighty-one million, three hundred twenty-three thousand, one hundred twenty-nine".