955861561 has 2 divisors, whose sum is σ = 955861562. Its totient is φ = 955861560.

The previous prime is 955861549. The next prime is 955861579. The reversal of 955861561 is 165168559.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 948332025 + 7529536 = 30795^2 + 2744^2 .

It is a cyclic number.

It is not a de Polignac number, because 955861561 - 2²⁷ = 821643833 is a prime.

It is not a weakly prime, because it can be changed into another prime (955861541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 477930780 + 477930781.

It is an arithmetic number, because the mean of its divisors is an integer number (477930781).

Almost surely, 2^955861561 is an apocalyptic number.

It is an amenable number.

955861561 is a deficient number, since it is larger than the sum of its proper divisors (1).

955861561 is an equidigital number, since it uses as much as digits as its factorization.

955861561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 324000, while the sum is 46.

The square root of 955861561 is about 30917.0108678054. The cubic root of 955861561 is about 985.0652506441.

The spelling of 955861561 in words is "nine hundred fifty-five million, eight hundred sixty-one thousand, five hundred sixty-one".