1016245721 has 4 divisors (see below), whose sum is σ = 1041032244. Its totient is φ = 991459200.

The previous prime is 1016245717. The next prime is 1016245733. The reversal of 1016245721 is 1275426101.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 62980096 + 953265625 = 7936^2 + 30875^2 .

It is a cyclic number.

It is not a de Polignac number, because 1016245721 - 2² = 1016245717 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1016245121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12393200 + ... + 12393281.

It is an arithmetic number, because the mean of its divisors is an integer number (260258061).

Almost surely, 2^1016245721 is an apocalyptic number.

It is an amenable number.

1016245721 is a deficient number, since it is larger than the sum of its proper divisors (24786523).

1016245721 is an equidigital number, since it uses as much as digits as its factorization.

1016245721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24786522.

The product of its (nonzero) digits is 3360, while the sum is 29.

The square root of 1016245721 is about 31878.6091446914. The cubic root of 1016245721 is about 1005.3861773410.

The spelling of 1016245721 in words is "one billion, sixteen million, two hundred forty-five thousand, seven hundred twenty-one".