679987031 has 4 divisors (see below), whose sum is σ = 680351952. Its totient is φ = 679622112.

The previous prime is 679987013. The next prime is 679987037. The reversal of 679987031 is 130789976.

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

It is a cyclic number.

It is not a de Polignac number, because 679987031 - 2¹⁸ = 679724887 is a prime.

It is a super-2 number, since 2×679987031² = 924764724656389922, 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 (679987037) 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, 179651 + ... + 183396.

It is an arithmetic number, because the mean of its divisors is an integer number (170087988).

Almost surely, 2^679987031 is an apocalyptic number.

679987031 is a deficient number, since it is larger than the sum of its proper divisors (364921).

679987031 is a wasteful number, since it uses less digits than its factorization.

679987031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 364920.

The product of its (nonzero) digits is 571536, while the sum is 50.

The square root of 679987031 is about 26076.5609504014. The cubic root of 679987031 is about 879.3603439565.

The spelling of 679987031 in words is "six hundred seventy-nine million, nine hundred eighty-seven thousand, thirty-one".