961427561 has 2 divisors, whose sum is σ = 961427562. Its totient is φ = 961427560.

The previous prime is 961427483. The next prime is 961427563. The reversal of 961427561 is 165724169.

961427561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 894907225 + 66520336 = 29915^2 + 8156^2 .

It is a cyclic number.

It is not a de Polignac number, because 961427561 - 2²⁶ = 894318697 is a prime.

Together with 961427563, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (961427563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 480713780 + 480713781.

It is an arithmetic number, because the mean of its divisors is an integer number (480713781).

Almost surely, 2^961427561 is an apocalyptic number.

It is an amenable number.

961427561 is a deficient number, since it is larger than the sum of its proper divisors (1).

961427561 is an equidigital number, since it uses as much as digits as its factorization.

961427561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 90720, while the sum is 41.

The square root of 961427561 is about 31006.8953782864. The cubic root of 961427561 is about 986.9735692443.

The spelling of 961427561 in words is "nine hundred sixty-one million, four hundred twenty-seven thousand, five hundred sixty-one".