168939431 has 4 divisors (see below), whose sum is σ = 177831000. Its totient is φ = 160047864.

The previous prime is 168939377. The next prime is 168939437. The reversal of 168939431 is 134939861.

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 168939431 - 2¹⁴ = 168923047 is a prime.

It is a super-2 number, since 2×168939431² = 57081062693207522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (168939437) 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, 4445756 + ... + 4445793.

It is an arithmetic number, because the mean of its divisors is an integer number (44457750).

Almost surely, 2^168939431 is an apocalyptic number.

168939431 is a deficient number, since it is larger than the sum of its proper divisors (8891569).

168939431 is an equidigital number, since it uses as much as digits as its factorization.

168939431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8891568.

The product of its digits is 139968, while the sum is 44.

The square root of 168939431 is about 12997.6702143115. The cubic root of 168939431 is about 552.8114237002.

The spelling of 168939431 in words is "one hundred sixty-eight million, nine hundred thirty-nine thousand, four hundred thirty-one".