697139 has 4 divisors (see below), whose sum is σ = 704424. Its totient is φ = 689856.

The previous prime is 697133. The next prime is 697141. The reversal of 697139 is 931796.

697139 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-697139 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 16.

It is a zygodrome in base 16.

It is a junction number, because it is equal to n+sod(n) for n = 697099 and 697108.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 697139.

It is not an unprimeable number, because it can be changed into a prime (697133) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3497 + ... + 3690.

It is an arithmetic number, because the mean of its divisors is an integer number (176106).

2⁶⁹⁷¹³⁹ is an apocalyptic number.

697139 is a deficient number, since it is larger than the sum of its proper divisors (7285).

697139 is an equidigital number, since it uses as much as digits as its factorization.

697139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7284.

The product of its digits is 10206, while the sum is 35.

The square root of 697139 is about 834.9485014059. The cubic root of 697139 is about 88.6692686468.

The spelling of 697139 in words is "six hundred ninety-seven thousand, one hundred thirty-nine".