68537129 has 4 divisors (see below), whose sum is σ = 69166020. Its totient is φ = 67908240.

The previous prime is 68537101. The next prime is 68537137. The reversal of 68537129 is 92173586.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 49632025 + 18905104 = 7045^2 + 4348^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68537129 is a prime.

It is a super-3 number, since 3×68537129³ (a number of 24 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68537159) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 314282 + ... + 314499.

It is an arithmetic number, because the mean of its divisors is an integer number (17291505).

Almost surely, 2^68537129 is an apocalyptic number.

It is an amenable number.

68537129 is a deficient number, since it is larger than the sum of its proper divisors (628891).

68537129 is a wasteful number, since it uses less digits than its factorization.

68537129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 628890.

The product of its digits is 90720, while the sum is 41.

The square root of 68537129 is about 8278.7154196771. The cubic root of 68537129 is about 409.2373866771.

The spelling of 68537129 in words is "sixty-eight million, five hundred thirty-seven thousand, one hundred twenty-nine".