1252086781 has 8 divisors (see below), whose sum is σ = 1371230784. Its totient is φ = 1133829120.

The previous prime is 1252086769. The next prime is 1252086791. The reversal of 1252086781 is 1876802521.

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

It is a cyclic number.

It is not a de Polignac number, because 1252086781 - 2⁷ = 1252086653 is a prime.

It is a super-2 number, since 2×1252086781² = 3135442614309883922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1252086751) by changing a digit.

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, 218625 + ... + 224278.

It is an arithmetic number, because the mean of its divisors is an integer number (171403848).

Almost surely, 2^1252086781 is an apocalyptic number.

1252086781 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1252086781 is a deficient number, since it is larger than the sum of its proper divisors (119144003).

1252086781 is a wasteful number, since it uses less digits than its factorization.

1252086781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 443171.

The product of its (nonzero) digits is 53760, while the sum is 40.

The square root of 1252086781 is about 35384.8382926925. The cubic root of 1252086781 is about 1077.8164561994.

The spelling of 1252086781 in words is "one billion, two hundred fifty-two million, eighty-six thousand, seven hundred eighty-one".