698631871 has 4 divisors (see below), whose sum is σ = 798436432. Its totient is φ = 598827312.

The previous prime is 698631853. The next prime is 698631889. The reversal of 698631871 is 178136896.

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

It is an interprime number because it is at equal distance from previous prime (698631853) and next prime (698631889).

It is a cyclic number.

It is not a de Polignac number, because 698631871 - 2¹⁹ = 698107583 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (698631971) 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, 49902270 + ... + 49902283.

It is an arithmetic number, because the mean of its divisors is an integer number (199609108).

Almost surely, 2^698631871 is an apocalyptic number.

698631871 is a deficient number, since it is larger than the sum of its proper divisors (99804561).

698631871 is an equidigital number, since it uses as much as digits as its factorization.

698631871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99804560.

The product of its digits is 435456, while the sum is 49.

The square root of 698631871 is about 26431.6452571534. The cubic root of 698631871 is about 887.3251638935.

The spelling of 698631871 in words is "six hundred ninety-eight million, six hundred thirty-one thousand, eight hundred seventy-one".