691481 has 8 divisors (see below), whose sum is σ = 796224. Its totient is φ = 588240.

The previous prime is 691463. The next prime is 691489. The reversal of 691481 is 184196.

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 691481 - 2¹⁴ = 675097 is a prime.

It is a super-2 number, since 2×691481² = 956291946722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (691489) 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, 926 + ... + 1496.

It is an arithmetic number, because the mean of its divisors is an integer number (99528).

2⁶⁹¹⁴⁸¹ is an apocalyptic number.

It is an amenable number.

691481 is a deficient number, since it is larger than the sum of its proper divisors (104743).

691481 is a wasteful number, since it uses less digits than its factorization.

691481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 751.

The product of its digits is 1728, while the sum is 29.

The square root of 691481 is about 831.5533656958. The cubic root of 691481 is about 88.4287359743.

The spelling of 691481 in words is "six hundred ninety-one thousand, four hundred eighty-one".