68163121 has 4 divisors (see below), whose sum is σ = 73406452. Its totient is φ = 62919792.

The previous prime is 68163119. The next prime is 68163131. The reversal of 68163121 is 12136186.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12136186 = 2 ⋅6068093.

It can be written as a sum of positive squares in 2 ways, for example, as 25391521 + 42771600 = 5039^2 + 6540^2 .

It is not a de Polignac number, because 68163121 - 2¹ = 68163119 is a prime.

It is a super-2 number, since 2×68163121² = 9292422128921282, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 68163121.

It is not an unprimeable number, because it can be changed into a prime (68163101) 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, 2621646 + ... + 2621671.

It is an arithmetic number, because the mean of its divisors is an integer number (18351613).

Almost surely, 2^68163121 is an apocalyptic number.

It is an amenable number.

68163121 is a deficient number, since it is larger than the sum of its proper divisors (5243331).

68163121 is a wasteful number, since it uses less digits than its factorization.

68163121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5243330.

The product of its digits is 1728, while the sum is 28.

The square root of 68163121 is about 8256.0959902365. The cubic root of 68163121 is about 408.4916239099.

The spelling of 68163121 in words is "sixty-eight million, one hundred sixty-three thousand, one hundred twenty-one".