10721569 has 2 divisors, whose sum is σ = 10721570. Its totient is φ = 10721568.

The previous prime is 10721549. The next prime is 10721587. The reversal of 10721569 is 96512701.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6969600 + 3751969 = 2640^2 + 1937^2 .

It is an emirp because it is prime and its reverse (96512701) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 10721569 - 2⁹ = 10721057 is a prime.

It is a super-2 number, since 2×10721569² = 229904083643522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 10721569.

It is not a weakly prime, because it can be changed into another prime (10721549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5360784 + 5360785.

It is an arithmetic number, because the mean of its divisors is an integer number (5360785).

Almost surely, 2^10721569 is an apocalyptic number.

It is an amenable number.

10721569 is a deficient number, since it is larger than the sum of its proper divisors (1).

10721569 is an equidigital number, since it uses as much as digits as its factorization.

10721569 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3780, while the sum is 31.

The square root of 10721569 is about 3274.3807048051. The cubic root of 10721569 is about 220.5055111119.

The spelling of 10721569 in words is "ten million, seven hundred twenty-one thousand, five hundred sixty-nine".