83131511 has 2 divisors, whose sum is σ = 83131512. Its totient is φ = 83131510.

The previous prime is 83131493. The next prime is 83131549. The reversal of 83131511 is 11513138.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-83131511 is a prime.

It is a super-2 number, since 2×83131511² = 13821696242286242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (83131561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41565755 + 41565756.

It is an arithmetic number, because the mean of its divisors is an integer number (41565756).

Almost surely, 2^83131511 is an apocalyptic number.

83131511 is a deficient number, since it is larger than the sum of its proper divisors (1).

83131511 is an equidigital number, since it uses as much as digits as its factorization.

83131511 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 360, while the sum is 23.

The square root of 83131511 is about 9117.6483261859. The cubic root of 83131511 is about 436.4373312258.

Adding to 83131511 its reverse (11513138), we get a palindrome (94644649).

The spelling of 83131511 in words is "eighty-three million, one hundred thirty-one thousand, five hundred eleven".