68191261 has 4 divisors (see below), whose sum is σ = 68866524. Its totient is φ = 67516000.

The previous prime is 68191243. The next prime is 68191273. The reversal of 68191261 is 16219186.

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 30184036 + 38007225 = 5494^2 + 6165^2 .

It is a cyclic number.

It is not a de Polignac number, because 68191261 - 2¹¹ = 68189213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68191061) 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, 337480 + ... + 337681.

It is an arithmetic number, because the mean of its divisors is an integer number (17216631).

Almost surely, 2^68191261 is an apocalyptic number.

It is an amenable number.

68191261 is a deficient number, since it is larger than the sum of its proper divisors (675263).

68191261 is a wasteful number, since it uses less digits than its factorization.

68191261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 675262.

The product of its digits is 5184, while the sum is 34.

The square root of 68191261 is about 8257.8000096878. The cubic root of 68191261 is about 408.5478291456.

The spelling of 68191261 in words is "sixty-eight million, one hundred ninety-one thousand, two hundred sixty-one".