16242991 has 8 divisors (see below), whose sum is σ = 17034624. Its totient is φ = 15458520.

The previous prime is 16242983. The next prime is 16243009. The reversal of 16242991 is 19924261.

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

It is a cyclic number.

It is not a de Polignac number, because 16242991 - 2³ = 16242983 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16242931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3180 + ... + 6526.

It is an arithmetic number, because the mean of its divisors is an integer number (2129328).

Almost surely, 2^16242991 is an apocalyptic number.

16242991 is a deficient number, since it is larger than the sum of its proper divisors (791633).

16242991 is a wasteful number, since it uses less digits than its factorization.

16242991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3581.

The product of its digits is 7776, while the sum is 34.

The square root of 16242991 is about 4030.2594209306. The cubic root of 16242991 is about 253.2534291321.

The spelling of 16242991 in words is "sixteen million, two hundred forty-two thousand, nine hundred ninety-one".