139191755 has 4 divisors (see below), whose sum is σ = 167030112. Its totient is φ = 111353400.

The previous prime is 139191749. The next prime is 139191757. The reversal of 139191755 is 557191931.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 139191755 - 2⁸ = 139191499 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (139191757) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13919171 + ... + 13919180.

It is an arithmetic number, because the mean of its divisors is an integer number (41757528).

Almost surely, 2^139191755 is an apocalyptic number.

139191755 is a deficient number, since it is larger than the sum of its proper divisors (27838357).

139191755 is an equidigital number, since it uses as much as digits as its factorization.

139191755 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27838356.

The product of its digits is 42525, while the sum is 41.

The square root of 139191755 is about 11797.9555432287. The cubic root of 139191755 is about 518.2482412077.

The spelling of 139191755 in words is "one hundred thirty-nine million, one hundred ninety-one thousand, seven hundred fifty-five".