1251006220 has 24 divisors (see below), whose sum is σ = 2628201744. Its totient is φ = 500195136.

The previous prime is 1251006199. The next prime is 1251006221. The reversal of 1251006220 is 226001521.

It is not an unprimeable number, because it can be changed into a prime (1251006221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42247 + ... + 65473.

It is an arithmetic number, because the mean of its divisors is an integer number (109508406).

Almost surely, 2^1251006220 is an apocalyptic number.

1251006220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1251006220 is an abundant number, since it is smaller than the sum of its proper divisors (1377195524).

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

1251006220 is a wasteful number, since it uses less digits than its factorization.

1251006220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25929 (or 25927 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 1251006220 is about 35369.5662964645. The cubic root of 1251006220 is about 1077.5063121958.

Adding to 1251006220 its reverse (226001521), we get a palindrome (1477007741).

The spelling of 1251006220 in words is "one billion, two hundred fifty-one million, six thousand, two hundred twenty".