1251246020 has 48 divisors (see below), whose sum is σ = 2712925488. Its totient is φ = 484392960.

The previous prime is 1251246001. The next prime is 1251246041. The reversal of 1251246020 is 206421521.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 63616576 + 1187629444 = 7976^2 + 34462^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 138440 + ... + 147200.

It is an arithmetic number, because the mean of its divisors is an integer number (56519281).

Almost surely, 2^1251246020 is an apocalyptic number.

1251246020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1251246020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1356462744).

1251246020 is an abundant number, since it is smaller than the sum of its proper divisors (1461679468).

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

1251246020 is a wasteful number, since it uses less digits than its factorization.

1251246020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9000 (or 8998 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 1251246020 is about 35372.9560540252. The cubic root of 1251246020 is about 1077.5751553136.

Adding to 1251246020 its reverse (206421521), we get a palindrome (1457667541).

The spelling of 1251246020 in words is "one billion, two hundred fifty-one million, two hundred forty-six thousand, twenty".