139172213 has 4 divisors (see below), whose sum is σ = 139195980. Its totient is φ = 139148448.

The previous prime is 139172197. The next prime is 139172239. The reversal of 139172213 is 312271931.

139172213 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 312271931 = 1319 ⋅236749.

It can be written as a sum of positive squares in 2 ways, for example, as 53831569 + 85340644 = 7337^2 + 9238^2 .

It is a cyclic number.

It is not a de Polignac number, because 139172213 - 2⁴ = 139172197 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139172413) 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, 3803 + ... + 17111.

It is an arithmetic number, because the mean of its divisors is an integer number (34798995).

Almost surely, 2^139172213 is an apocalyptic number.

It is an amenable number.

139172213 is a deficient number, since it is larger than the sum of its proper divisors (23767).

139172213 is a wasteful number, since it uses less digits than its factorization.

139172213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23766.

The product of its digits is 2268, while the sum is 29.

The square root of 139172213 is about 11797.1273198182. The cubic root of 139172213 is about 518.2239867033.

The spelling of 139172213 in words is "one hundred thirty-nine million, one hundred seventy-two thousand, two hundred thirteen".