1251251250126 has 32 divisors (see below), whose sum is σ = 2695473939840. Its totient is φ = 385942856544.

The previous prime is 1251251250091. The next prime is 1251251250127. The reversal of 1251251250126 is 6210521521521.

It is a super-3 number, since 3×1251251250126³ (a number of 37 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1251251250127) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 127621705 + ... + 127631508.

It is an arithmetic number, because the mean of its divisors is an integer number (84233560620).

Almost surely, 2^{1251251250126} is an apocalyptic number.

1251251250126 is an abundant number, since it is smaller than the sum of its proper divisors (1444222689714).

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

1251251250126 is a wasteful number, since it uses less digits than its factorization.

1251251250126 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 255253280.

The product of its (nonzero) digits is 12000, while the sum is 33.

Adding to 1251251250126 its reverse (6210521521521), we get a palindrome (7461772771647).

The spelling of 1251251250126 in words is "one trillion, two hundred fifty-one billion, two hundred fifty-one million, two hundred fifty thousand, one hundred twenty-six".