139681273 has 2 divisors, whose sum is σ = 139681274. Its totient is φ = 139681272.

The previous prime is 139681247. The next prime is 139681357. The reversal of 139681273 is 372186931.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 129777664 + 9903609 = 11392^2 + 3147^2 .

It is a cyclic number.

It is not a de Polignac number, because 139681273 - 2¹³ = 139673081 is a prime.

It is not a weakly prime, because it can be changed into another prime (139684273) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69840636 + 69840637.

It is an arithmetic number, because the mean of its divisors is an integer number (69840637).

Almost surely, 2^139681273 is an apocalyptic number.

It is an amenable number.

139681273 is a deficient number, since it is larger than the sum of its proper divisors (1).

139681273 is an equidigital number, since it uses as much as digits as its factorization.

139681273 is an evil number, because the sum of its binary digits is even.

The product of its digits is 54432, while the sum is 40.

The square root of 139681273 is about 11818.6832176855. The cubic root of 139681273 is about 518.8550659981.

The spelling of 139681273 in words is "one hundred thirty-nine million, six hundred eighty-one thousand, two hundred seventy-three".