139535961 has 8 divisors (see below), whose sum is σ = 186162240. Its totient is φ = 92966832.

The previous prime is 139535959. The next prime is 139535999. The reversal of 139535961 is 169535931.

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

It is not a de Polignac number, because 139535961 - 2¹ = 139535959 is a prime.

It is not an unprimeable number, because it can be changed into a prime (139535911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8221 + ... + 18618.

It is an arithmetic number, because the mean of its divisors is an integer number (23270280).

Almost surely, 2^139535961 is an apocalyptic number.

It is an amenable number.

139535961 is a deficient number, since it is larger than the sum of its proper divisors (46626279).

139535961 is a wasteful number, since it uses less digits than its factorization.

139535961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28575.

The product of its digits is 109350, while the sum is 42.

The square root of 139535961 is about 11812.5340634429. The cubic root of 139535961 is about 518.6750799820.

The spelling of 139535961 in words is "one hundred thirty-nine million, five hundred thirty-five thousand, nine hundred sixty-one".