139949213 has 2 divisors, whose sum is σ = 139949214. Its totient is φ = 139949212.

The previous prime is 139949209. The next prime is 139949237. The reversal of 139949213 is 312949931.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 139665124 + 284089 = 11818^2 + 533^2 .

It is a cyclic number.

It is not a de Polignac number, because 139949213 - 2² = 139949209 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (139949413) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69974606 + 69974607.

It is an arithmetic number, because the mean of its divisors is an integer number (69974607).

Almost surely, 2^139949213 is an apocalyptic number.

It is an amenable number.

139949213 is a deficient number, since it is larger than the sum of its proper divisors (1).

139949213 is an equidigital number, since it uses as much as digits as its factorization.

139949213 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 52488, while the sum is 41.

The square root of 139949213 is about 11830.0132290712. The cubic root of 139949213 is about 519.1866142107.

The spelling of 139949213 in words is "one hundred thirty-nine million, nine hundred forty-nine thousand, two hundred thirteen".