1251122156 has 12 divisors (see below), whose sum is σ = 2189761392. Its totient is φ = 625476048.

The previous prime is 1251122143. The next prime is 1251122161. The reversal of 1251122156 is 6512211521.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21326 + ... + 54378.

It is an arithmetic number, because the mean of its divisors is an integer number (182480116).

Almost surely, 2^1251122156 is an apocalyptic number.

It is an amenable number.

1251122156 is a deficient number, since it is larger than the sum of its proper divisors (938639236).

1251122156 is a wasteful number, since it uses less digits than its factorization.

1251122156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42520 (or 42518 counting only the distinct ones).

The product of its digits is 1200, while the sum is 26.

The square root of 1251122156 is about 35371.2051816163. The cubic root of 1251122156 is about 1077.5395968459.

Adding to 1251122156 its reverse (6512211521), we get a palindrome (7763333677).

The spelling of 1251122156 in words is "one billion, two hundred fifty-one million, one hundred twenty-two thousand, one hundred fifty-six".