7139081 has 4 divisors (see below), whose sum is σ = 7144464. Its totient is φ = 7133700.

The previous prime is 7139071. The next prime is 7139089. The reversal of 7139081 is 1809317.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1809317 = 83 ⋅21799.

It is a cyclic number.

It is not a de Polignac number, because 7139081 - 2¹⁴ = 7122697 is a prime.

It is a super-2 number, since 2×7139081² = 101932955049122, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (7139089) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 866 + ... + 3876.

It is an arithmetic number, because the mean of its divisors is an integer number (1786116).

Almost surely, 2^7139081 is an apocalyptic number.

It is an amenable number.

7139081 is a deficient number, since it is larger than the sum of its proper divisors (5383).

7139081 is a wasteful number, since it uses less digits than its factorization.

7139081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5382.

The product of its (nonzero) digits is 1512, while the sum is 29.

The square root of 7139081 is about 2671.9058740906. The cubic root of 7139081 is about 192.5517351249.

The spelling of 7139081 in words is "seven million, one hundred thirty-nine thousand, eighty-one".