1016221261 has 8 divisors (see below), whose sum is σ = 1144366848. Its totient is φ = 894036000.

The previous prime is 1016221249. The next prime is 1016221307. The reversal of 1016221261 is 1621226101.

1016221261 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1016221261 - 2¹¹ = 1016219213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1016221561) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1489720 + ... + 1490401.

It is an arithmetic number, because the mean of its divisors is an integer number (143045856).

Almost surely, 2^1016221261 is an apocalyptic number.

1016221261 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1016221261 is a deficient number, since it is larger than the sum of its proper divisors (128145587).

1016221261 is a wasteful number, since it uses less digits than its factorization.

1016221261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2980163.

The product of its (nonzero) digits is 288, while the sum is 22.

The square root of 1016221261 is about 31878.2254995475. The cubic root of 1016221261 is about 1005.3781110690.

Adding to 1016221261 its reverse (1621226101), we get a palindrome (2637447362).

The spelling of 1016221261 in words is "one billion, sixteen million, two hundred twenty-one thousand, two hundred sixty-one".