1231329973 has 8 divisors (see below), whose sum is σ = 1259781336. Its totient is φ = 1203072000.

The previous prime is 1231329961. The next prime is 1231329977. The reversal of 1231329973 is 3799231321.

It can be written as a sum of positive squares in 4 ways, for example, as 85710564 + 1145619409 = 9258^2 + 33847^2 .

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

It is not a de Polignac number, because 1231329973 - 2²⁵ = 1197775541 is a prime.

It is a super-3 number, since 3×1231329973³ (a number of 28 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231329977) 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, 35428 + ... + 60973.

It is an arithmetic number, because the mean of its divisors is an integer number (157472667).

Almost surely, 2^1231329973 is an apocalyptic number.

It is an amenable number.

1231329973 is a deficient number, since it is larger than the sum of its proper divisors (28451363).

1231329973 is an equidigital number, since it uses as much as digits as its factorization.

1231329973 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96695.

The product of its digits is 61236, while the sum is 40.

The square root of 1231329973 is about 35090.3116686073. The cubic root of 1231329973 is about 1071.8273061853.

The spelling of 1231329973 in words is "one billion, two hundred thirty-one million, three hundred twenty-nine thousand, nine hundred seventy-three".