139249494581 has 8 divisors (see below), whose sum is σ = 139721712000. Its totient is φ = 138777434640.

The previous prime is 139249494511. The next prime is 139249494589. The reversal of 139249494581 is 185494942931.

139249494581 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-139249494581 is a prime.

It is a super-2 number, since 2×139249494581² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 139249494581.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139249494589) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1891775 + ... + 1964003.

It is an arithmetic number, because the mean of its divisors is an integer number (17465214000).

Almost surely, 2^139249494581 is an apocalyptic number.

It is an amenable number.

139249494581 is a deficient number, since it is larger than the sum of its proper divisors (472217419).

139249494581 is an equidigital number, since it uses as much as digits as its factorization.

139249494581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78739.

The product of its digits is 11197440, while the sum is 59.

The spelling of 139249494581 in words is "one hundred thirty-nine billion, two hundred forty-nine million, four hundred ninety-four thousand, five hundred eighty-one".