2151512225 has 6 divisors (see below), whose sum is σ = 2667875190. Its totient is φ = 1721209760.

The previous prime is 2151512191. The next prime is 2151512239. The reversal of 2151512225 is 5222151512.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 352988944 + 1798523281 = 18788^2 + 42409^2 .

It is not a de Polignac number, because 2151512225 - 2⁸ = 2151511969 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2151512194 and 2151512203.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 43030220 + ... + 43030269.

It is an arithmetic number, because the mean of its divisors is an integer number (444645865).

Almost surely, 2^2151512225 is an apocalyptic number.

2151512225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

2151512225 is a deficient number, since it is larger than the sum of its proper divisors (516362965).

2151512225 is an equidigital number, since it uses as much as digits as its factorization.

2151512225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86060499 (or 86060494 counting only the distinct ones).

The product of its digits is 2000, while the sum is 26.

The square root of 2151512225 is about 46384.3963526529. The cubic root of 2151512225 is about 1290.9654101707.

Adding to 2151512225 its reverse (5222151512), we get a palindrome (7373663737).

The spelling of 2151512225 in words is "two billion, one hundred fifty-one million, five hundred twelve thousand, two hundred twenty-five".