16562261 has 2 divisors, whose sum is σ = 16562262. Its totient is φ = 16562260.

The previous prime is 16562257. The next prime is 16562269. The reversal of 16562261 is 16226561.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14822500 + 1739761 = 3850^2 + 1319^2 .

It is a cyclic number.

It is not a de Polignac number, because 16562261 - 2² = 16562257 is a prime.

It is a Chen prime.

It is a nialpdrome in base 16.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16562269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8281130 + 8281131.

It is an arithmetic number, because the mean of its divisors is an integer number (8281131).

Almost surely, 2^16562261 is an apocalyptic number.

It is an amenable number.

16562261 is a deficient number, since it is larger than the sum of its proper divisors (1).

16562261 is an equidigital number, since it uses as much as digits as its factorization.

16562261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4320, while the sum is 29.

The square root of 16562261 is about 4069.6757856124. The cubic root of 16562261 is about 254.9019794992.

It can be divided in two parts, 1656 and 2261, that multiplied together give a triangular number (3744216 = T₂₇₃₆).

The spelling of 16562261 in words is "sixteen million, five hundred sixty-two thousand, two hundred sixty-one".