139978271 has 2 divisors, whose sum is σ = 139978272. Its totient is φ = 139978270.

The previous prime is 139978261. The next prime is 139978277. The reversal of 139978271 is 172879931.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 139978271 - 2¹⁰ = 139977247 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (139978277) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69989135 + 69989136.

It is an arithmetic number, because the mean of its divisors is an integer number (69989136).

Almost surely, 2^139978271 is an apocalyptic number.

139978271 is a deficient number, since it is larger than the sum of its proper divisors (1).

139978271 is an equidigital number, since it uses as much as digits as its factorization.

139978271 is an evil number, because the sum of its binary digits is even.

The product of its digits is 190512, while the sum is 47.

The square root of 139978271 is about 11831.2413127279. The cubic root of 139978271 is about 519.2225450560. Note that the first 3 decimals are identical.

The spelling of 139978271 in words is "one hundred thirty-nine million, nine hundred seventy-eight thousand, two hundred seventy-one".