7681139 has 4 divisors (see below), whose sum is σ = 7760424. Its totient is φ = 7601856.

The previous prime is 7681123. The next prime is 7681147. The reversal of 7681139 is 9311867.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 7681139 - 2⁴ = 7681123 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 7681099 and 7681108.

It is not an unprimeable number, because it can be changed into a prime (7681109) 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, 39497 + ... + 39690.

It is an arithmetic number, because the mean of its divisors is an integer number (1940106).

Almost surely, 2^7681139 is an apocalyptic number.

7681139 is a deficient number, since it is larger than the sum of its proper divisors (79285).

7681139 is an equidigital number, since it uses as much as digits as its factorization.

7681139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79284.

The product of its digits is 9072, while the sum is 35.

The square root of 7681139 is about 2771.4867851029. The cubic root of 7681139 is about 197.3067189905.

The spelling of 7681139 in words is "seven million, six hundred eighty-one thousand, one hundred thirty-nine".