139056861 has 8 divisors (see below), whose sum is σ = 186065440. Its totient is φ = 92376432.

The previous prime is 139056857. The next prime is 139056899. The reversal of 139056861 is 168650931.

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

It is not a de Polignac number, because 139056861 - 2² = 139056857 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139056811) 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, 81046 + ... + 82743.

It is an arithmetic number, because the mean of its divisors is an integer number (23258180).

Almost surely, 2^139056861 is an apocalyptic number.

It is an amenable number.

139056861 is a deficient number, since it is larger than the sum of its proper divisors (47008579).

139056861 is a wasteful number, since it uses less digits than its factorization.

139056861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 164075.

The product of its (nonzero) digits is 38880, while the sum is 39.

The square root of 139056861 is about 11792.2373195251. The cubic root of 139056861 is about 518.0807715810.

The spelling of 139056861 in words is "one hundred thirty-nine million, fifty-six thousand, eight hundred sixty-one".