1251163212 has 48 divisors (see below), whose sum is σ = 3328893792. Its totient is φ = 362327040.

The previous prime is 1251163189. The next prime is 1251163213. The reversal of 1251163212 is 2123611521.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (1251163213) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 233239 + ... + 238542.

It is an arithmetic number, because the mean of its divisors is an integer number (69351954).

Almost surely, 2^1251163212 is an apocalyptic number.

1251163212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1251163212 is an abundant number, since it is smaller than the sum of its proper divisors (2077730580).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1251163212 is a wasteful number, since it uses less digits than its factorization.

1251163212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 471818 (or 471816 counting only the distinct ones).

The product of its digits is 720, while the sum is 24.

The square root of 1251163212 is about 35371.7855359324. The cubic root of 1251163212 is about 1077.5513833267.

Adding to 1251163212 its reverse (2123611521), we get a palindrome (3374774733).

The spelling of 1251163212 in words is "one billion, two hundred fifty-one million, one hundred sixty-three thousand, two hundred twelve".