2151172 has 6 divisors (see below), whose sum is σ = 3764558. Its totient is φ = 1075584.

The previous prime is 2151157. The next prime is 2151179. The reversal of 2151172 is 2711512.

It can be written as a sum of positive squares in only one way, i.e., 1943236 + 207936 = 1394^2 + 456^2 .

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (2151179) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 268893 + ... + 268900.

2^2151172 is an apocalyptic number.

It is an amenable number.

2151172 is a deficient number, since it is larger than the sum of its proper divisors (1613386).

2151172 is a wasteful number, since it uses less digits than its factorization.

2151172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 537797 (or 537795 counting only the distinct ones).

The product of its digits is 140, while the sum is 19.

The square root of 2151172 is about 1466.6874240955. The cubic root of 2151172 is about 129.0897358522.

Adding to 2151172 its reverse (2711512), we get a palindrome (4862684).

The spelling of 2151172 in words is "two million, one hundred fifty-one thousand, one hundred seventy-two".