156222025 has 6 divisors (see below), whose sum is σ = 193715342. Its totient is φ = 124977600.

The previous prime is 156222023. The next prime is 156222041. The reversal of 156222025 is 520222651.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 2064969 + 154157056 = 1437^2 + 12416^2 .

It is not a de Polignac number, because 156222025 - 2¹ = 156222023 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25), and also a Moran number because the ratio is a prime number: 6248881 = 156222025 / (1 + 5 + 6 + 2 + 2 + 2 + 0 + 2 + 5).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (156222023) by changing a digit.

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, 3124416 + ... + 3124465.

Almost surely, 2^156222025 is an apocalyptic number.

It is an amenable number.

156222025 is a deficient number, since it is larger than the sum of its proper divisors (37493317).

156222025 is an equidigital number, since it uses as much as digits as its factorization.

156222025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6248891 (or 6248886 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 156222025 is about 12498.8809499091. The cubic root of 156222025 is about 538.5765264238.

Adding to 156222025 its reverse (520222651), we get a palindrome (676444676).

The spelling of 156222025 in words is "one hundred fifty-six million, two hundred twenty-two thousand, twenty-five".