698631 has 4 divisors (see below), whose sum is σ = 931512. Its totient is φ = 465752.

The previous prime is 698591. The next prime is 698641. The reversal of 698631 is 136896.

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 698631 - 2⁶ = 698567 is a prime.

It is a super-2 number, since 2×698631² = 976170548322, which contains 22 as substring.

It is a D-number.

698631 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 698592 and 698601.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 698631.

It is not an unprimeable number, because it can be changed into a prime (698641) 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, 116436 + ... + 116441.

It is an arithmetic number, because the mean of its divisors is an integer number (232878).

2⁶⁹⁸⁶³¹ is an apocalyptic number.

698631 is a deficient number, since it is larger than the sum of its proper divisors (232881).

698631 is a wasteful number, since it uses less digits than its factorization.

698631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 232880.

The product of its digits is 7776, while the sum is 33.

The square root of 698631 is about 835.8414921503. The cubic root of 698631 is about 88.7324795144.

The spelling of 698631 in words is "six hundred ninety-eight thousand, six hundred thirty-one".