2151172225 has 24 divisors (see below), whose sum is σ = 2697992000. Its totient is φ = 1701311040.

The previous prime is 2151172213. The next prime is 2151172241. The reversal of 2151172225 is 5222711512.

It is not a de Polignac number, because 2151172225 - 2¹⁹ = 2150647937 is a prime.

It is a super-2 number, since 2×2151172225² = 9255083883222901250, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2151172193 and 2151172202.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2340316 + ... + 2341234.

Almost surely, 2^2151172225 is an apocalyptic number.

2151172225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

2151172225 is a deficient number, since it is larger than the sum of its proper divisors (546819775).

2151172225 is a wasteful number, since it uses less digits than its factorization.

2151172225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1897 (or 1892 counting only the distinct ones).

The product of its digits is 2800, while the sum is 28.

The square root of 2151172225 is about 46380.7311822485. The cubic root of 2151172225 is about 1290.8974035291.

Adding to 2151172225 its reverse (5222711512), we get a palindrome (7373883737).

The spelling of 2151172225 in words is "two billion, one hundred fifty-one million, one hundred seventy-two thousand, two hundred twenty-five".