1251100428 has 24 divisors (see below), whose sum is σ = 2968714560. Its totient is φ = 409964880.

The previous prime is 1251100427. The next prime is 1251100451. The reversal of 1251100428 is 8240011521.

It is a junction number, because it is equal to n+sod(n) for n = 1251100398 and 1251100407.

It is not an unprimeable number, because it can be changed into a prime (1251100427) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 882838 + ... + 884253.

It is an arithmetic number, because the mean of its divisors is an integer number (123696440).

Almost surely, 2^1251100428 is an apocalyptic number.

It is an amenable number.

1251100428 is an abundant number, since it is smaller than the sum of its proper divisors (1717614132).

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

1251100428 is a wasteful number, since it uses less digits than its factorization.

1251100428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1767157 (or 1767155 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 24.

The square root of 1251100428 is about 35370.8980377937. The cubic root of 1251100428 is about 1077.5333590015.

Adding to 1251100428 its reverse (8240011521), we get a palindrome (9491111949).

The spelling of 1251100428 in words is "one billion, two hundred fifty-one million, one hundred thousand, four hundred twenty-eight".