2129173397 has 8 divisors (see below), whose sum is σ = 2293583544. Its totient is φ = 1964852928.

The previous prime is 2129173393. The next prime is 2129173429. The reversal of 2129173397 is 7933719212.

It can be written as a sum of positive squares in 4 ways, for example, as 1013212561 + 1115960836 = 31831^2 + 33406^2 .

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 2129173397 - 2² = 2129173393 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 (2129173391) 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, 31763 + ... + 72575.

It is an arithmetic number, because the mean of its divisors is an integer number (286697943).

Almost surely, 2^2129173397 is an apocalyptic number.

It is an amenable number.

2129173397 is a deficient number, since it is larger than the sum of its proper divisors (164410147).

2129173397 is a wasteful number, since it uses less digits than its factorization.

2129173397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44839.

The product of its digits is 142884, while the sum is 44.

The square root of 2129173397 is about 46142.9669288831. The cubic root of 2129173397 is about 1286.4818903480.

The spelling of 2129173397 in words is "two billion, one hundred twenty-nine million, one hundred seventy-three thousand, three hundred ninety-seven".