15722261 has 4 divisors (see below), whose sum is σ = 15988800. Its totient is φ = 15455724.

The previous prime is 15722251. The next prime is 15722279. The reversal of 15722261 is 16222751.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 15722261 - 2⁶ = 15722197 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 15722261.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15722221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 133181 + ... + 133298.

It is an arithmetic number, because the mean of its divisors is an integer number (3997200).

Almost surely, 2^15722261 is an apocalyptic number.

It is an amenable number.

15722261 is a deficient number, since it is larger than the sum of its proper divisors (266539).

15722261 is an equidigital number, since it uses as much as digits as its factorization.

15722261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 266538.

The product of its digits is 1680, while the sum is 26.

The square root of 15722261 is about 3965.1306409751. The cubic root of 15722261 is about 250.5176527361.

The spelling of 15722261 in words is "fifteen million, seven hundred twenty-two thousand, two hundred sixty-one".