68511031 has 2 divisors, whose sum is σ = 68511032. Its totient is φ = 68511030.

The previous prime is 68510999. The next prime is 68511049. The reversal of 68511031 is 13011586.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 68511031 - 2⁵ = 68510999 is a prime.

It is a super-2 number, since 2×68511031² = 9387522737365922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 68510987 and 68511005.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68511061) 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, 34255515 + 34255516.

It is an arithmetic number, because the mean of its divisors is an integer number (34255516).

Almost surely, 2^68511031 is an apocalyptic number.

68511031 is a deficient number, since it is larger than the sum of its proper divisors (1).

68511031 is an equidigital number, since it uses as much as digits as its factorization.

68511031 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 720, while the sum is 25.

The square root of 68511031 is about 8277.1390588778. The cubic root of 68511031 is about 409.1854360853.

The spelling of 68511031 in words is "sixty-eight million, five hundred eleven thousand, thirty-one".