139052081 has 8 divisors (see below), whose sum is σ = 164043264. Its totient is φ = 115342560.

The previous prime is 139052077. The next prime is 139052083. The reversal of 139052081 is 180250931.

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 139052081 - 2² = 139052077 is a prime.

It is a super-2 number, since 2×139052081² = 38670962460861122, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (139052083) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 320180 + ... + 320613.

It is an arithmetic number, because the mean of its divisors is an integer number (20505408).

Almost surely, 2^139052081 is an apocalyptic number.

It is an amenable number.

139052081 is a deficient number, since it is larger than the sum of its proper divisors (24991183).

139052081 is an equidigital number, since it uses as much as digits as its factorization.

139052081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 640831.

The product of its (nonzero) digits is 2160, while the sum is 29.

The square root of 139052081 is about 11792.0346420794. The cubic root of 139052081 is about 518.0748352697.

The spelling of 139052081 in words is "one hundred thirty-nine million, fifty-two thousand, eighty-one".