698981 has 4 divisors (see below), whose sum is σ = 701100. Its totient is φ = 696864.

The previous prime is 698977. The next prime is 698983. The reversal of 698981 is 189896.

698981 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 401956 + 297025 = 634^2 + 545^2 .

It is a cyclic number.

It is not a de Polignac number, because 698981 - 2² = 698977 is a prime.

It is a super-2 number, since 2×698981² = 977148876722, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a nialpdrome in base 16.

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 698981.

It is not an unprimeable number, because it can be changed into a prime (698983) 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, 446 + ... + 1263.

It is an arithmetic number, because the mean of its divisors is an integer number (175275).

2⁶⁹⁸⁹⁸¹ is an apocalyptic number.

It is an amenable number.

698981 is a deficient number, since it is larger than the sum of its proper divisors (2119).

698981 is a wasteful number, since it uses less digits than its factorization.

698981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2118.

The product of its digits is 31104, while the sum is 41.

The square root of 698981 is about 836.0508357750. The cubic root of 698981 is about 88.7472947664.

The spelling of 698981 in words is "six hundred ninety-eight thousand, nine hundred eighty-one".