706640131 has 2 divisors, whose sum is σ = 706640132. Its totient is φ = 706640130.

The previous prime is 706640117. The next prime is 706640141. The reversal of 706640131 is 131046607.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-706640131 is a prime.

It is a super-2 number, since 2×706640131² = 998680549479394322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 706640131.

It is not a weakly prime, because it can be changed into another prime (706640101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 353320065 + 353320066.

It is an arithmetic number, because the mean of its divisors is an integer number (353320066).

Almost surely, 2^706640131 is an apocalyptic number.

706640131 is a deficient number, since it is larger than the sum of its proper divisors (1).

706640131 is an equidigital number, since it uses as much as digits as its factorization.

706640131 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3024, while the sum is 28.

The square root of 706640131 is about 26582.7036059164. The cubic root of 706640131 is about 890.7026942148.

Adding to 706640131 its reverse (131046607), we get a palindrome (837686738).

The spelling of 706640131 in words is "seven hundred six million, six hundred forty thousand, one hundred thirty-one".