68162991 has 16 divisors (see below), whose sum is σ = 100522464. Its totient is φ = 40811904.

The previous prime is 68162989. The next prime is 68162993. The reversal of 68162991 is 19926186.

It is an interprime number because it is at equal distance from previous prime (68162989) and next prime (68162993).

It is not a de Polignac number, because 68162991 - 2¹ = 68162989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68162993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22176 + ... + 25061.

It is an arithmetic number, because the mean of its divisors is an integer number (6282654).

Almost surely, 2^68162991 is an apocalyptic number.

68162991 is a deficient number, since it is larger than the sum of its proper divisors (32359473).

68162991 is a wasteful number, since it uses less digits than its factorization.

68162991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47290.

The product of its digits is 46656, while the sum is 42.

The square root of 68162991 is about 8256.0881172623. The cubic root of 68162991 is about 408.4913642194.

The spelling of 68162991 in words is "sixty-eight million, one hundred sixty-two thousand, nine hundred ninety-one".