919945961 has 8 divisors (see below), whose sum is σ = 1008834048. Its totient is φ = 831934000.

The previous prime is 919945937. The next prime is 919945991. The reversal of 919945961 is 169549919.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 919945961 - 2¹⁰ = 919944937 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (919945991) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 216830 + ... + 221031.

It is an arithmetic number, because the mean of its divisors is an integer number (126104256).

Almost surely, 2^919945961 is an apocalyptic number.

It is an amenable number.

919945961 is a deficient number, since it is larger than the sum of its proper divisors (88888087).

919945961 is a wasteful number, since it uses less digits than its factorization.

919945961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 438063.

The product of its digits is 787320, while the sum is 53.

The square root of 919945961 is about 30330.6109565897. The cubic root of 919945961 is about 972.5697831911.

The spelling of 919945961 in words is "nine hundred nineteen million, nine hundred forty-five thousand, nine hundred sixty-one".