2172155237 has 8 divisors (see below), whose sum is σ = 2488536000. Its totient is φ = 1857292704.

The previous prime is 2172155231. The next prime is 2172155239. The reversal of 2172155237 is 7325512712.

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 2172155237 - 2⁶ = 2172155173 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2172155197 and 2172155206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2172155231) 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, 376487 + ... + 382212.

It is an arithmetic number, because the mean of its divisors is an integer number (311067000).

Almost surely, 2^2172155237 is an apocalyptic number.

It is an amenable number.

2172155237 is a deficient number, since it is larger than the sum of its proper divisors (316380763).

2172155237 is an equidigital number, since it uses as much as digits as its factorization.

2172155237 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 759115.

The product of its digits is 29400, while the sum is 35.

The square root of 2172155237 is about 46606.3862254949. The cubic root of 2172155237 is about 1295.0810634844.

Adding to 2172155237 its reverse (7325512712), we get a palindrome (9497667949).

The spelling of 2172155237 in words is "two billion, one hundred seventy-two million, one hundred fifty-five thousand, two hundred thirty-seven".