1252811609290 has 8 divisors (see below), whose sum is σ = 2255060896740. Its totient is φ = 501124643712.

The previous prime is 1252811609207. The next prime is 1252811609311. The reversal of 1252811609290 is 929061182521.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1250194570641 + 2617038649 = 1118121^2 + 51157^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-3 number, since 3×1252811609290³ (a number of 37 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a self number, because there is not a number n which added to its sum of digits gives 1252811609290.

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 3 ways as a sum of consecutive naturals, for example, 62640580455 + ... + 62640580474.

Almost surely, 2^{1252811609290} is an apocalyptic number.

1252811609290 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1252811609290 is a deficient number, since it is larger than the sum of its proper divisors (1002249287450).

1252811609290 is a wasteful number, since it uses less digits than its factorization.

1252811609290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125281160936.

The product of its (nonzero) digits is 155520, while the sum is 46.

The spelling of 1252811609290 in words is "one trillion, two hundred fifty-two billion, eight hundred eleven million, six hundred nine thousand, two hundred ninety".