10121561 has 2 divisors, whose sum is σ = 10121562. Its totient is φ = 10121560.

The previous prime is 10121543. The next prime is 10121603. The reversal of 10121561 is 16512101.

10121561 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., 9265936 + 855625 = 3044^2 + 925^2 .

It is a cyclic number.

It is not a de Polignac number, because 10121561 - 2¹⁸ = 9859417 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (10121521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5060780 + 5060781.

It is an arithmetic number, because the mean of its divisors is an integer number (5060781).

Almost surely, 2^10121561 is an apocalyptic number.

It is an amenable number.

10121561 is a deficient number, since it is larger than the sum of its proper divisors (1).

10121561 is an equidigital number, since it uses as much as digits as its factorization.

10121561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 60, while the sum is 17.

The square root of 10121561 is about 3181.4400827298. The cubic root of 10121561 is about 216.3129394576.

Adding to 10121561 its reverse (16512101), we get a palindrome (26633662).

The spelling of 10121561 in words is "ten million, one hundred twenty-one thousand, five hundred sixty-one".