7139971 has 2 divisors, whose sum is σ = 7139972. Its totient is φ = 7139970.

The previous prime is 7139947. The next prime is 7139999. The reversal of 7139971 is 1799317.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 7139971 - 2⁵ = 7139939 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 7139971.

It is not a weakly prime, because it can be changed into another prime (7139071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3569985 + 3569986.

It is an arithmetic number, because the mean of its divisors is an integer number (3569986).

Almost surely, 2^7139971 is an apocalyptic number.

7139971 is a deficient number, since it is larger than the sum of its proper divisors (1).

7139971 is an equidigital number, since it uses as much as digits as its factorization.

7139971 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11907, while the sum is 37.

The square root of 7139971 is about 2672.0724166834. The cubic root of 7139971 is about 192.5597363379.

The spelling of 7139971 in words is "seven million, one hundred thirty-nine thousand, nine hundred seventy-one".