697521 has 16 divisors (see below), whose sum is σ = 1059840. Its totient is φ = 403920.

The previous prime is 697519. The next prime is 697523. The reversal of 697521 is 125796.

It is an interprime number because it is at equal distance from previous prime (697519) and next prime (697523).

It is not a de Polignac number, because 697521 - 2¹ = 697519 is a prime.

697521 is a lucky number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 697521.

It is not an unprimeable number, because it can be changed into a prime (697523) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 300 + ... + 1218.

It is an arithmetic number, because the mean of its divisors is an integer number (66240).

2⁶⁹⁷⁵²¹ is an apocalyptic number.

It is an amenable number.

697521 is a deficient number, since it is larger than the sum of its proper divisors (362319).

697521 is a wasteful number, since it uses less digits than its factorization.

697521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 956.

The product of its digits is 3780, while the sum is 30.

The square root of 697521 is about 835.1772267010. The cubic root of 697521 is about 88.6854612453.

It can be divided in two parts, 6975 and 21, that added together give a palindrome (6996).

The spelling of 697521 in words is "six hundred ninety-seven thousand, five hundred twenty-one".