1249801539 has 32 divisors (see below), whose sum is σ = 1928134656. Its totient is φ = 705348000.

The previous prime is 1249801519. The next prime is 1249801541. The reversal of 1249801539 is 9351089421.

It is not a de Polignac number, because 1249801539 - 2⁷ = 1249801411 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1249801539.

It is not an unprimeable number, because it can be changed into a prime (1249801519) 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 31 ways as a sum of consecutive naturals, for example, 668484 + ... + 670350.

It is an arithmetic number, because the mean of its divisors is an integer number (60254208).

Almost surely, 2^1249801539 is an apocalyptic number.

1249801539 is a deficient number, since it is larger than the sum of its proper divisors (678333117).

1249801539 is a wasteful number, since it uses less digits than its factorization.

1249801539 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2255.

The product of its (nonzero) digits is 77760, while the sum is 42.

The square root of 1249801539 is about 35352.5322855379. The cubic root of 1249801539 is about 1077.1603324968.

The spelling of 1249801539 in words is "one billion, two hundred forty-nine million, eight hundred one thousand, five hundred thirty-nine".