698878961 has 4 divisors (see below), whose sum is σ = 762413424. Its totient is φ = 635344500.

The previous prime is 698878949. The next prime is 698878991. The reversal of 698878961 is 169878896.

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 a de Polignac number, because none of the positive numbers 2^k-698878961 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 698878894 and 698878903.

It is not an unprimeable number, because it can be changed into a prime (698878991) 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, 31767215 + ... + 31767236.

It is an arithmetic number, because the mean of its divisors is an integer number (190603356).

Almost surely, 2^698878961 is an apocalyptic number.

It is an amenable number.

698878961 is a deficient number, since it is larger than the sum of its proper divisors (63534463).

698878961 is a wasteful number, since it uses less digits than its factorization.

698878961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63534462.

The product of its digits is 10450944, while the sum is 62.

The square root of 698878961 is about 26436.3189759845. The cubic root of 698878961 is about 887.4297603871.

The spelling of 698878961 in words is "six hundred ninety-eight million, eight hundred seventy-eight thousand, nine hundred sixty-one".