139353971 has 2 divisors, whose sum is σ = 139353972. Its totient is φ = 139353970.

The previous prime is 139353887. The next prime is 139353997. The reversal of 139353971 is 179353931.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 139353971 - 2¹⁰ = 139352947 is a prime.

It is equal to p_7877642 and since 139353971 and 7877642 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (139353371) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69676985 + 69676986.

It is an arithmetic number, because the mean of its divisors is an integer number (69676986).

Almost surely, 2^139353971 is an apocalyptic number.

139353971 is a deficient number, since it is larger than the sum of its proper divisors (1).

139353971 is an equidigital number, since it uses as much as digits as its factorization.

139353971 is an evil number, because the sum of its binary digits is even.

The product of its digits is 76545, while the sum is 41.

The square root of 139353971 is about 11804.8282918474. The cubic root of 139353971 is about 518.4494876100.

The spelling of 139353971 in words is "one hundred thirty-nine million, three hundred fifty-three thousand, nine hundred seventy-one".