698611681 has 4 divisors (see below), whose sum is σ = 703300500. Its totient is φ = 693922864.

The previous prime is 698611663. The next prime is 698611687. The reversal of 698611681 is 186116896.

It is a happy number.

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 457275456 + 241336225 = 21384^2 + 15535^2 .

It is a cyclic number.

It is not a de Polignac number, because 698611681 - 2⁵ = 698611649 is a prime.

It is a super-2 number, since 2×698611681² = 976116561659291522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (698611687) 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, 2344186 + ... + 2344483.

It is an arithmetic number, because the mean of its divisors is an integer number (175825125).

Almost surely, 2^698611681 is an apocalyptic number.

It is an amenable number.

698611681 is a deficient number, since it is larger than the sum of its proper divisors (4688819).

698611681 is a wasteful number, since it uses less digits than its factorization.

698611681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4688818.

The product of its digits is 124416, while the sum is 46.

The square root of 698611681 is about 26431.2633258420. The cubic root of 698611681 is about 887.3166161073.

The spelling of 698611681 in words is "six hundred ninety-eight million, six hundred eleven thousand, six hundred eighty-one".