698431381 has 8 divisors (see below), whose sum is σ = 701634200. Its totient is φ = 695236608.

The previous prime is 698431379. The next prime is 698431387. The reversal of 698431381 is 183134896.

698431381 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 226021156 + 472410225 = 15034^2 + 21735^2 .

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 698431381 - 2¹ = 698431379 is a prime.

It is a super-2 number, since 2×698431381² = 975612787931134322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (698431387) 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, 227545 + ... + 230593.

It is an arithmetic number, because the mean of its divisors is an integer number (87704275).

Almost surely, 2^698431381 is an apocalyptic number.

It is an amenable number.

698431381 is a deficient number, since it is larger than the sum of its proper divisors (3202819).

698431381 is a wasteful number, since it uses less digits than its factorization.

698431381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4023.

The product of its digits is 124416, while the sum is 43.

The square root of 698431381 is about 26427.8523720714. The cubic root of 698431381 is about 887.2402756761.

The spelling of 698431381 in words is "six hundred ninety-eight million, four hundred thirty-one thousand, three hundred eighty-one".