139661345 has 4 divisors (see below), whose sum is σ = 167593620. Its totient is φ = 111729072.

The previous prime is 139661339. The next prime is 139661351. The reversal of 139661345 is 543166931.

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

It is an interprime number because it is at equal distance from previous prime (139661339) and next prime (139661351).

It can be written as a sum of positive squares in 2 ways, for example, as 91317136 + 48344209 = 9556^2 + 6953^2 .

It is a cyclic number.

It is not a de Polignac number, because 139661345 - 2⁴ = 139661329 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 139661299 and 139661308.

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, 13966130 + ... + 13966139.

It is an arithmetic number, because the mean of its divisors is an integer number (41898405).

Almost surely, 2^139661345 is an apocalyptic number.

It is an amenable number.

139661345 is a deficient number, since it is larger than the sum of its proper divisors (27932275).

139661345 is an equidigital number, since it uses as much as digits as its factorization.

139661345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27932274.

The product of its digits is 58320, while the sum is 38.

The square root of 139661345 is about 11817.8401156895. The cubic root of 139661345 is about 518.8303902123.

The spelling of 139661345 in words is "one hundred thirty-nine million, six hundred sixty-one thousand, three hundred forty-five".