168993951 has 8 divisors (see below), whose sum is σ = 257514624. Its totient is φ = 96567960.

The previous prime is 168993943. The next prime is 168993953. The reversal of 168993951 is 159399861.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 168993951 - 2³ = 168993943 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 168993894 and 168993903.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (168993953) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4023645 + ... + 4023686.

It is an arithmetic number, because the mean of its divisors is an integer number (32189328).

Almost surely, 2^168993951 is an apocalyptic number.

168993951 is a deficient number, since it is larger than the sum of its proper divisors (88520673).

168993951 is an equidigital number, since it uses as much as digits as its factorization.

168993951 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8047341.

The product of its digits is 524880, while the sum is 51.

The square root of 168993951 is about 12999.7673440720. The cubic root of 168993951 is about 552.8708849265.

The spelling of 168993951 in words is "one hundred sixty-eight million, nine hundred ninety-three thousand, nine hundred fifty-one".