2157375349 has 18 divisors (see below), whose sum is σ = 2321641026. Its totient is φ = 2003901120.

The previous prime is 2157375331. The next prime is 2157375359. The reversal of 2157375349 is 9435737512.

It can be written as a sum of positive squares in 3 ways, for example, as 717704100 + 1439671249 = 26790^2 + 37943^2 .

It is a de Polignac number, because none of the positive numbers 2^k-2157375349 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2157375299 and 2157375308.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2157375359) 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 17 ways as a sum of consecutive naturals, for example, 6892417 + ... + 6892729.

It is an arithmetic number, because the mean of its divisors is an integer number (128980057).

Almost surely, 2^2157375349 is an apocalyptic number.

It is an amenable number.

2157375349 is a deficient number, since it is larger than the sum of its proper divisors (164265677).

2157375349 is an frugal number, since it uses more digits than its factorization.

2157375349 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 725 (or 393 counting only the distinct ones).

The product of its digits is 793800, while the sum is 46.

The square root of 2157375349 is about 46447.5548226169. The cubic root of 2157375349 is about 1292.1370241063.

The spelling of 2157375349 in words is "two billion, one hundred fifty-seven million, three hundred seventy-five thousand, three hundred forty-nine".