10961581 has 2 divisors, whose sum is σ = 10961582. Its totient is φ = 10961580.

The previous prime is 10961579. The next prime is 10961597. The reversal of 10961581 is 18516901.

10961581 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10949481 + 12100 = 3309^2 + 110^2 .

It is a cyclic number.

It is not a de Polignac number, because 10961581 - 2¹ = 10961579 is a prime.

It is a super-2 number, since 2×10961581² = 240312516039122, which contains 22 as substring.

Together with 10961579, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10961521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5480790 + 5480791.

It is an arithmetic number, because the mean of its divisors is an integer number (5480791).

Almost surely, 2^10961581 is an apocalyptic number.

It is an amenable number.

10961581 is a deficient number, since it is larger than the sum of its proper divisors (1).

10961581 is an equidigital number, since it uses as much as digits as its factorization.

10961581 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2160, while the sum is 31.

The square root of 10961581 is about 3310.8278420963. The cubic root of 10961581 is about 222.1387885768.

The spelling of 10961581 in words is "ten million, nine hundred sixty-one thousand, five hundred eighty-one".