68531013 has 12 divisors (see below), whose sum is σ = 100346220. Its totient is φ = 45061056.

The previous prime is 68530963. The next prime is 68531033. The reversal of 68531013 is 31013586.

It can be written as a sum of positive squares in 2 ways, for example, as 56295009 + 12236004 = 7503^2 + 3498^2 .

It is not a de Polignac number, because 68531013 - 2¹⁸ = 68268869 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68531033) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 51498 + ... + 52811.

It is an arithmetic number, because the mean of its divisors is an integer number (8362185).

Almost surely, 2^68531013 is an apocalyptic number.

It is an amenable number.

68531013 is a deficient number, since it is larger than the sum of its proper divisors (31815207).

68531013 is a wasteful number, since it uses less digits than its factorization.

68531013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104388 (or 104385 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 68531013 is about 8278.3460304580. The cubic root of 68531013 is about 409.2252133712.

Adding to 68531013 its reverse (31013586), we get a palindrome (99544599).

The spelling of 68531013 in words is "sixty-eight million, five hundred thirty-one thousand, thirteen".