706691 has 4 divisors (see below), whose sum is σ = 708384. Its totient is φ = 705000.

The previous prime is 706679. The next prime is 706703. The reversal of 706691 is 196607.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 196607 = 421 ⋅467.

It is an interprime number because it is at equal distance from previous prime (706679) and next prime (706703).

It is a cyclic number.

It is not a de Polignac number, because 706691 - 2¹⁸ = 444547 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a plaindrome in base 14.

It is not an unprimeable number, because it can be changed into a prime (706621) 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, 281 + ... + 1221.

It is an arithmetic number, because the mean of its divisors is an integer number (177096).

2⁷⁰⁶⁶⁹¹ is an apocalyptic number.

706691 is a deficient number, since it is larger than the sum of its proper divisors (1693).

706691 is an equidigital number, since it uses as much as digits as its factorization.

706691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1692.

The product of its (nonzero) digits is 2268, while the sum is 29.

The square root of 706691 is about 840.6491539281. The cubic root of 706691 is about 89.0724066748.

The spelling of 706691 in words is "seven hundred six thousand, six hundred ninety-one".