1251440106 has 48 divisors (see below), whose sum is σ = 2948423040. Its totient is φ = 353021760.

The previous prime is 1251440087. The next prime is 1251440119. The reversal of 1251440106 is 6010441521.

It is a happy number.

It is a super-2 number, since 2×1251440106² = 3132204677810582472, which contains 22 as substring.

It is a Curzon number.

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, 3715 + ... + 50166.

It is an arithmetic number, because the mean of its divisors is an integer number (61425480).

Almost surely, 2^1251440106 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1251440106, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1474211520).

1251440106 is an abundant number, since it is smaller than the sum of its proper divisors (1696982934).

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

1251440106 is a wasteful number, since it uses less digits than its factorization.

1251440106 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53979 (or 53972 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 24.

The square root of 1251440106 is about 35375.6993711785. The cubic root of 1251440106 is about 1077.6308681618.

Adding to 1251440106 its reverse (6010441521), we get a palindrome (7261881627).

The spelling of 1251440106 in words is "one billion, two hundred fifty-one million, four hundred forty thousand, one hundred six".