1251142450 has 12 divisors (see below), whose sum is σ = 2327125050. Its totient is φ = 500456960.

The previous prime is 1251142393. The next prime is 1251142463. The reversal of 1251142450 is 542411521.

It can be written as a sum of positive squares in 3 ways, for example, as 870073009 + 381069441 = 29497^2 + 19521^2 .

It is a Harshad number since it is a multiple of its sum of digits (25).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12511375 + ... + 12511474.

Almost surely, 2^1251142450 is an apocalyptic number.

1251142450 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1251142450 is a deficient number, since it is larger than the sum of its proper divisors (1075982600).

1251142450 is a wasteful number, since it uses less digits than its factorization.

1251142450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25022861 (or 25022856 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 25.

The square root of 1251142450 is about 35371.4920522163. The cubic root of 1251142450 is about 1077.5454229411.

Adding to 1251142450 its reverse (542411521), we get a palindrome (1793553971).

The spelling of 1251142450 in words is "one billion, two hundred fifty-one million, one hundred forty-two thousand, four hundred fifty".