691459 has 4 divisors (see below), whose sum is σ = 693880. Its totient is φ = 689040.

The previous prime is 691451. The next prime is 691463. The reversal of 691459 is 954196.

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 691459 - 2³ = 691451 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (691451) 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, 714 + ... + 1375.

It is an arithmetic number, because the mean of its divisors is an integer number (173470).

2⁶⁹¹⁴⁵⁹ is an apocalyptic number.

691459 is a deficient number, since it is larger than the sum of its proper divisors (2421).

691459 is a wasteful number, since it uses less digits than its factorization.

691459 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2420.

The product of its digits is 9720, while the sum is 34.

The square root of 691459 is about 831.5401373355. The cubic root of 691459 is about 88.4277981549.

The spelling of 691459 in words is "six hundred ninety-one thousand, four hundred fifty-nine".