961551771 has 4 divisors (see below), whose sum is σ = 1282069032. Its totient is φ = 641034512.

The previous prime is 961551761. The next prime is 961551779. The reversal of 961551771 is 177155169.

961551771 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 961551771 - 2²³ = 953163163 is a prime.

It is not an unprimeable number, because it can be changed into a prime (961551779) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 160258626 + ... + 160258631.

It is an arithmetic number, because the mean of its divisors is an integer number (320517258).

Almost surely, 2^961551771 is an apocalyptic number.

961551771 is a deficient number, since it is larger than the sum of its proper divisors (320517261).

961551771 is a wasteful number, since it uses less digits than its factorization.

961551771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 320517260.

The product of its digits is 66150, while the sum is 42.

The square root of 961551771 is about 31008.8982551783. The cubic root of 961551771 is about 987.0160708718.

The spelling of 961551771 in words is "nine hundred sixty-one million, five hundred fifty-one thousand, seven hundred seventy-one".