16121709 has 24 divisors (see below), whose sum is σ = 25365600. Its totient is φ = 9828000.

The previous prime is 16121701. The next prime is 16121711. The reversal of 16121709 is 90712161.

It is not a de Polignac number, because 16121709 - 2³ = 16121701 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16121701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3334 + ... + 6584.

It is an arithmetic number, because the mean of its divisors is an integer number (1056900).

Almost surely, 2^16121709 is an apocalyptic number.

16121709 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

16121709 is a deficient number, since it is larger than the sum of its proper divisors (9243891).

16121709 is a wasteful number, since it uses less digits than its factorization.

16121709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3305 (or 3302 counting only the distinct ones).

The product of its (nonzero) digits is 756, while the sum is 27.

The square root of 16121709 is about 4015.1848027208. The cubic root of 16121709 is about 252.6215289245.

It can be divided in two parts, 1612 and 1709, that added together give a triangular number (3321 = T₈₁).

The spelling of 16121709 in words is "sixteen million, one hundred twenty-one thousand, seven hundred nine".