698538161 has 4 divisors (see below), whose sum is σ = 698959872. Its totient is φ = 698116452.

The previous prime is 698538149. The next prime is 698538193. The reversal of 698538161 is 161835896.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 698538161 - 2¹⁴ = 698521777 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (698538131) 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, 208361 + ... + 211686.

It is an arithmetic number, because the mean of its divisors is an integer number (174739968).

Almost surely, 2^698538161 is an apocalyptic number.

It is an amenable number.

698538161 is a deficient number, since it is larger than the sum of its proper divisors (421711).

698538161 is a wasteful number, since it uses less digits than its factorization.

698538161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 421710.

The product of its digits is 311040, while the sum is 47.

The square root of 698538161 is about 26429.8725119892. The cubic root of 698538161 is about 887.2854887500.

The spelling of 698538161 in words is "six hundred ninety-eight million, five hundred thirty-eight thousand, one hundred sixty-one".