16121949 has 8 divisors (see below), whose sum is σ = 21640800. Its totient is φ = 10675536.

The previous prime is 16121921. The next prime is 16121971. The reversal of 16121949 is 94912161.

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

It is not a de Polignac number, because 16121949 - 2⁹ = 16121437 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16121909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17587 + ... + 18480.

It is an arithmetic number, because the mean of its divisors is an integer number (2705100).

Almost surely, 2^16121949 is an apocalyptic number.

It is an amenable number.

16121949 is a deficient number, since it is larger than the sum of its proper divisors (5518851).

16121949 is a wasteful number, since it uses less digits than its factorization.

16121949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36219.

The product of its digits is 3888, while the sum is 33.

The square root of 16121949 is about 4015.2146891542. The cubic root of 16121949 is about 252.6227824902.

The spelling of 16121949 in words is "sixteen million, one hundred twenty-one thousand, nine hundred forty-nine".