679702981 has 2 divisors, whose sum is σ = 679702982. Its totient is φ = 679702980.

The previous prime is 679702967. The next prime is 679702997. The reversal of 679702981 is 189207976.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 679644900 + 58081 = 26070^2 + 241^2 .

It is a cyclic number.

It is not a de Polignac number, because 679702981 - 2¹³ = 679694789 is a prime.

It is a super-2 number, since 2×679702981² = 923992284760572722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (679702901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 339851490 + 339851491.

It is an arithmetic number, because the mean of its divisors is an integer number (339851491).

Almost surely, 2^679702981 is an apocalyptic number.

It is an amenable number.

679702981 is a deficient number, since it is larger than the sum of its proper divisors (1).

679702981 is an equidigital number, since it uses as much as digits as its factorization.

679702981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 381024, while the sum is 49.

The square root of 679702981 is about 26071.1139194320. The cubic root of 679702981 is about 879.2378822610.

The spelling of 679702981 in words is "six hundred seventy-nine million, seven hundred two thousand, nine hundred eighty-one".