691427 has 8 divisors (see below), whose sum is σ = 760320. Its totient is φ = 623560.

The previous prime is 691409. The next prime is 691433. The reversal of 691427 is 724196.

691427 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 691427 - 2⁶ = 691363 is a prime.

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 691427.

It is not an unprimeable number, because it can be changed into a prime (691727) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2498 + ... + 2760.

It is an arithmetic number, because the mean of its divisors is an integer number (95040).

2⁶⁹¹⁴²⁷ is an apocalyptic number.

691427 is a deficient number, since it is larger than the sum of its proper divisors (68893).

691427 is a wasteful number, since it uses less digits than its factorization.

691427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 513.

The product of its digits is 3024, while the sum is 29.

The square root of 691427 is about 831.5208957086. The cubic root of 691427 is about 88.4264340185.

The spelling of 691427 in words is "six hundred ninety-one thousand, four hundred twenty-seven".