1251210140 has 24 divisors (see below), whose sum is σ = 2632957152. Its totient is φ = 499452480.

The previous prime is 1251210131. The next prime is 1251210157. The reversal of 1251210140 is 410121521.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 54491 + ... + 73970.

It is an arithmetic number, because the mean of its divisors is an integer number (109706548).

Almost surely, 2^1251210140 is an apocalyptic number.

1251210140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1251210140 is an abundant number, since it is smaller than the sum of its proper divisors (1381747012).

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

1251210140 is a wasteful number, since it uses less digits than its factorization.

1251210140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128957 (or 128955 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 17.

The square root of 1251210140 is about 35372.4488832764. The cubic root of 1251210140 is about 1077.5648552432.

Adding to 1251210140 its reverse (410121521), we get a palindrome (1661331661).

The spelling of 1251210140 in words is "one billion, two hundred fifty-one million, two hundred ten thousand, one hundred forty".