68121231 has 4 divisors (see below), whose sum is σ = 90828312. Its totient is φ = 45414152.

The previous prime is 68121187. The next prime is 68121233. The reversal of 68121231 is 13212186.

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

It is a cyclic number.

It is not a de Polignac number, because 68121231 - 2⁷ = 68121103 is a prime.

It is a super-2 number, since 2×68121231² = 9281004225910722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68121233) 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, 11353536 + ... + 11353541.

It is an arithmetic number, because the mean of its divisors is an integer number (22707078).

Almost surely, 2^68121231 is an apocalyptic number.

68121231 is a deficient number, since it is larger than the sum of its proper divisors (22707081).

68121231 is a wasteful number, since it uses less digits than its factorization.

68121231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22707080.

The product of its digits is 576, while the sum is 24.

The square root of 68121231 is about 8253.5586870150. The cubic root of 68121231 is about 408.4079265458.

It can be divided in two parts, 681 and 21231, that added together give a palindrome (21912).

The spelling of 68121231 in words is "sixty-eight million, one hundred twenty-one thousand, two hundred thirty-one".