16249999 has 4 divisors (see below), whose sum is σ = 16339960. Its totient is φ = 16160040.

The previous prime is 16249963. The next prime is 16250009. The reversal of 16249999 is 99994261.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99994261 = 2099 ⋅47639.

It is a cyclic number.

It is not a de Polignac number, because 16249999 - 2²³ = 7861391 is a prime.

It is a Duffinian number.

16249999 is a modest number, since divided by 9999 gives 1624 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16249099) 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 3 ways as a sum of consecutive naturals, for example, 44709 + ... + 45070.

It is an arithmetic number, because the mean of its divisors is an integer number (4084990).

Almost surely, 2^16249999 is an apocalyptic number.

16249999 is a deficient number, since it is larger than the sum of its proper divisors (89961).

16249999 is an equidigital number, since it uses as much as digits as its factorization.

16249999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89960.

The product of its digits is 314928, while the sum is 49.

The square root of 16249999 is about 4031.1287501145. The cubic root of 16249999 is about 253.2898457594.

It can be divided in two parts, 1 and 6249999, that added together give a 4-th power (6250000 = 50⁴).

The spelling of 16249999 in words is "sixteen million, two hundred forty-nine thousand, nine hundred ninety-nine".