68513181 has 16 divisors (see below), whose sum is σ = 99793920. Its totient is φ = 41465520.

The previous prime is 68513161. The next prime is 68513189. The reversal of 68513181 is 18131586.

68513181 is nontrivially palindromic in base 15.

It is not a de Polignac number, because 68513181 - 2¹¹ = 68511133 is a prime.

It is a super-2 number, since 2×68513181² = 9388111941477522, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68513189) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 46230 + ... + 47688.

It is an arithmetic number, because the mean of its divisors is an integer number (6237120).

Almost surely, 2^68513181 is an apocalyptic number.

It is an amenable number.

68513181 is a deficient number, since it is larger than the sum of its proper divisors (31280739).

68513181 is a wasteful number, since it uses less digits than its factorization.

68513181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2896.

The product of its digits is 5760, while the sum is 33.

The square root of 68513181 is about 8277.2689336520. The cubic root of 68513181 is about 409.1897163667.

The spelling of 68513181 in words is "sixty-eight million, five hundred thirteen thousand, one hundred eighty-one".