1211664125 has 32 divisors (see below), whose sum is σ = 1732243968. Its totient is φ = 828902400.

The previous prime is 1211664121. The next prime is 1211664149. The reversal of 1211664125 is 5214661121.

It is not a de Polignac number, because 1211664125 - 2² = 1211664121 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211664121) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 438749 + ... + 441501.

It is an arithmetic number, because the mean of its divisors is an integer number (54132624).

Almost surely, 2^1211664125 is an apocalyptic number.

It is an amenable number.

1211664125 is a deficient number, since it is larger than the sum of its proper divisors (520579843).

1211664125 is an equidigital number, since it uses as much as digits as its factorization.

1211664125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3278 (or 3268 counting only the distinct ones).

The product of its digits is 2880, while the sum is 29.

The square root of 1211664125 is about 34808.9661581610. The cubic root of 1211664125 is about 1066.0905240942.

The spelling of 1211664125 in words is "one billion, two hundred eleven million, six hundred sixty-four thousand, one hundred twenty-five".