139059181 has 8 divisors (see below), whose sum is σ = 139881528. Its totient is φ = 138240000.

The previous prime is 139059101. The next prime is 139059187. The reversal of 139059181 is 181950931.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 87721956 + 51337225 = 9366^2 + 7165^2 .

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

It is a 7-Lehmer number, since φ(139059181) divides (139059181-1)⁷.

It is a cyclic number.

It is not a de Polignac number, because 139059181 - 2¹¹ = 139057133 is a prime.

It is a super-2 number, since 2×139059181² = 38674911640781522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 139059181.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139059187) 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, 216621 + ... + 217261.

It is an arithmetic number, because the mean of its divisors is an integer number (17485191).

Almost surely, 2^139059181 is an apocalyptic number.

It is an amenable number.

139059181 is a deficient number, since it is larger than the sum of its proper divisors (822347).

139059181 is an equidigital number, since it uses as much as digits as its factorization.

139059181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1583.

The product of its (nonzero) digits is 9720, while the sum is 37.

The square root of 139059181 is about 11792.3356889125. The cubic root of 139059181 is about 518.0836527542.

The spelling of 139059181 in words is "one hundred thirty-nine million, fifty-nine thousand, one hundred eighty-one".