16121441 has 6 divisors (see below), whose sum is σ = 18753570. Its totient is φ = 13818336.

The previous prime is 16121437. The next prime is 16121447. The reversal of 16121441 is 14412161.

It can be written as a sum of positive squares in only one way, i.e., 12496225 + 3625216 = 3535^2 + 1904^2 .

It is not a de Polignac number, because 16121441 - 2² = 16121437 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 (16121447) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 164456 + ... + 164553.

It is an arithmetic number, because the mean of its divisors is an integer number (3125595).

Almost surely, 2^16121441 is an apocalyptic number.

It is an amenable number.

16121441 is a deficient number, since it is larger than the sum of its proper divisors (2632129).

16121441 is an equidigital number, since it uses as much as digits as its factorization.

16121441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 329023 (or 329016 counting only the distinct ones).

The product of its digits is 192, while the sum is 20.

The square root of 16121441 is about 4015.1514292739. The cubic root of 16121441 is about 252.6201290947.

The spelling of 16121441 in words is "sixteen million, one hundred twenty-one thousand, four hundred forty-one".