2172381257 has 16 divisors (see below), whose sum is σ = 2289917952. Its totient is φ = 2056879440.

The previous prime is 2172381223. The next prime is 2172381293. The reversal of 2172381257 is 7521832712.

It is a cyclic number.

It is not a de Polignac number, because 2172381257 - 2¹⁶ = 2172315721 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2172381257.

It is not an unprimeable number, because it can be changed into a prime (2172381217) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1039868 + ... + 1041954.

It is an arithmetic number, because the mean of its divisors is an integer number (143119872).

Almost surely, 2^2172381257 is an apocalyptic number.

It is an amenable number.

2172381257 is a deficient number, since it is larger than the sum of its proper divisors (117536695).

2172381257 is a wasteful number, since it uses less digits than its factorization.

2172381257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2548.

The product of its digits is 47040, while the sum is 38.

The square root of 2172381257 is about 46608.8109374183. The cubic root of 2172381257 is about 1295.1259810951.

The spelling of 2172381257 in words is "two billion, one hundred seventy-two million, three hundred eighty-one thousand, two hundred fifty-seven".