139168945 has 4 divisors (see below), whose sum is σ = 167002740. Its totient is φ = 111335152.

The previous prime is 139168891. The next prime is 139168957. The reversal of 139168945 is 549861931.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 549861931 = 6473 ⋅84947.

It can be written as a sum of positive squares in 2 ways, for example, as 29170801 + 109998144 = 5401^2 + 10488^2 .

It is a cyclic number.

It is not a de Polignac number, because 139168945 - 2²⁷ = 4951217 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 139168895 and 139168904.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13916890 + ... + 13916899.

It is an arithmetic number, because the mean of its divisors is an integer number (41750685).

Almost surely, 2^139168945 is an apocalyptic number.

It is an amenable number.

139168945 is a deficient number, since it is larger than the sum of its proper divisors (27833795).

139168945 is an equidigital number, since it uses as much as digits as its factorization.

139168945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27833794.

The product of its digits is 233280, while the sum is 46.

The square root of 139168945 is about 11796.9888107093. The cubic root of 139168945 is about 518.2199304117.

The spelling of 139168945 in words is "one hundred thirty-nine million, one hundred sixty-eight thousand, nine hundred forty-five".