698531 has 2 divisors, whose sum is σ = 698532. Its totient is φ = 698530.

The previous prime is 698527. The next prime is 698539. The reversal of 698531 is 135896.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 698531 - 2² = 698527 is a prime.

It is a super-2 number, since 2×698531² = 975891115922, which contains 22 as substring.

It is a Sophie Germain prime.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 698531.

It is not a weakly prime, because it can be changed into another prime (698539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 349265 + 349266.

It is an arithmetic number, because the mean of its divisors is an integer number (349266).

2⁶⁹⁸⁵³¹ is an apocalyptic number.

698531 is a deficient number, since it is larger than the sum of its proper divisors (1).

698531 is an equidigital number, since it uses as much as digits as its factorization.

698531 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6480, while the sum is 32.

The square root of 698531 is about 835.7816700550. The cubic root of 698531 is about 88.7282456764.

The spelling of 698531 in words is "six hundred ninety-eight thousand, five hundred thirty-one".