15622261 has 2 divisors, whose sum is σ = 15622262. Its totient is φ = 15622260.

The previous prime is 15622241. The next prime is 15622273. The reversal of 15622261 is 16222651.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9891025 + 5731236 = 3145^2 + 2394^2 .

It is an emirp because it is prime and its reverse (16222651) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 15622261 - 2¹³ = 15614069 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15622231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7811130 + 7811131.

It is an arithmetic number, because the mean of its divisors is an integer number (7811131).

Almost surely, 2^15622261 is an apocalyptic number.

It is an amenable number.

15622261 is a deficient number, since it is larger than the sum of its proper divisors (1).

15622261 is an equidigital number, since it uses as much as digits as its factorization.

15622261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1440, while the sum is 25.

The square root of 15622261 is about 3952.5006008855. The cubic root of 15622261 is about 249.9853911463.

The spelling of 15622261 in words is "fifteen million, six hundred twenty-two thousand, two hundred sixty-one".