1212154225 has 24 divisors (see below), whose sum is σ = 1550436480. Its totient is φ = 939395520.

The previous prime is 1212154193. The next prime is 1212154243. The reversal of 1212154225 is 5224512121.

It is not a de Polignac number, because 1212154225 - 2⁵ = 1212154193 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a self number, because there is not a number n which added to its sum of digits gives 1212154225.

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, 218334 + ... + 223816.

It is an arithmetic number, because the mean of its divisors is an integer number (64601520).

Almost surely, 2^1212154225 is an apocalyptic number.

It is an amenable number.

1212154225 is a deficient number, since it is larger than the sum of its proper divisors (338282255).

1212154225 is a wasteful number, since it uses less digits than its factorization.

1212154225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5769 (or 5764 counting only the distinct ones).

The product of its digits is 1600, while the sum is 25.

The square root of 1212154225 is about 34816.0052992873. The cubic root of 1212154225 is about 1066.2342439377.

Adding to 1212154225 its reverse (5224512121), we get a palindrome (6436666346).

The spelling of 1212154225 in words is "one billion, two hundred twelve million, one hundred fifty-four thousand, two hundred twenty-five".