139280291 has 2 divisors, whose sum is σ = 139280292. Its totient is φ = 139280290.

The previous prime is 139280261. The next prime is 139280327. The reversal of 139280291 is 192082931.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-139280291 is a prime.

It is a super-2 number, since 2×139280291² = 38797998922089362, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (139280231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69640145 + 69640146.

It is an arithmetic number, because the mean of its divisors is an integer number (69640146).

Almost surely, 2^139280291 is an apocalyptic number.

139280291 is a deficient number, since it is larger than the sum of its proper divisors (1).

139280291 is an equidigital number, since it uses as much as digits as its factorization.

139280291 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7776, while the sum is 35.

The square root of 139280291 is about 11801.7071222768. The cubic root of 139280291 is about 518.3580990109.

The spelling of 139280291 in words is "one hundred thirty-nine million, two hundred eighty thousand, two hundred ninety-one".