16021261 has 2 divisors, whose sum is σ = 16021262. Its totient is φ = 16021260.

The previous prime is 16021231. The next prime is 16021267. The reversal of 16021261 is 16212061.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13097161 + 2924100 = 3619^2 + 1710^2 .

It is an emirp because it is prime and its reverse (16212061) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16021261 - 2¹³ = 16013069 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16021267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8010630 + 8010631.

It is an arithmetic number, because the mean of its divisors is an integer number (8010631).

Almost surely, 2^16021261 is an apocalyptic number.

It is an amenable number.

16021261 is a deficient number, since it is larger than the sum of its proper divisors (1).

16021261 is an equidigital number, since it uses as much as digits as its factorization.

16021261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 16021261 is about 4002.6567427148. The cubic root of 16021261 is about 252.0957738337.

The spelling of 16021261 in words is "sixteen million, twenty-one thousand, two hundred sixty-one".