168994431 has 10 divisors (see below), whose sum is σ = 252448592. Its totient is φ = 112662900.

The previous prime is 168994387. The next prime is 168994439. The reversal of 168994431 is 134499861.

It is not a de Polignac number, because 168994431 - 2⁹ = 168993919 is a prime.

It is a super-2 number, since 2×168994431² = 57118235418027522, 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 (168994439) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 1043095 + ... + 1043256.

Almost surely, 2^168994431 is an apocalyptic number.

168994431 is a deficient number, since it is larger than the sum of its proper divisors (83454161).

168994431 is an equidigital number, since it uses as much as digits as its factorization.

168994431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2086363 (or 2086354 counting only the distinct ones).

The product of its digits is 186624, while the sum is 45.

The square root of 168994431 is about 12999.7858059277. The cubic root of 168994431 is about 552.8714083728.

The spelling of 168994431 in words is "one hundred sixty-eight million, nine hundred ninety-four thousand, four hundred thirty-one".