1211125425 has 48 divisors (see below), whose sum is σ = 2027280960. Its totient is φ = 637968640.

The previous prime is 1211125393. The next prime is 1211125471. The reversal of 1211125425 is 5245211121.

It is a happy number.

It is not a de Polignac number, because 1211125425 - 2⁵ = 1211125393 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1211125395 and 1211125404.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3490102 + ... + 3490448.

It is an arithmetic number, because the mean of its divisors is an integer number (42235020).

Almost surely, 2^1211125425 is an apocalyptic number.

1211125425 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1211125425 is a deficient number, since it is larger than the sum of its proper divisors (816155535).

1211125425 is a wasteful number, since it uses less digits than its factorization.

1211125425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 802 (or 797 counting only the distinct ones).

The product of its digits is 800, while the sum is 24.

The square root of 1211125425 is about 34801.2273490462. The cubic root of 1211125425 is about 1065.9325077801.

Adding to 1211125425 its reverse (5245211121), we get a palindrome (6456336546).

The spelling of 1211125425 in words is "one billion, two hundred eleven million, one hundred twenty-five thousand, four hundred twenty-five".