918999641 has 8 divisors (see below), whose sum is σ = 1051109184. Its totient is φ = 787096080.

The previous prime is 918999623. The next prime is 918999643. The reversal of 918999641 is 146999819.

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 918999641 - 2¹⁸ = 918737497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (918999643) 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, 41810 + ... + 59883.

It is an arithmetic number, because the mean of its divisors is an integer number (131388648).

Almost surely, 2^918999641 is an apocalyptic number.

It is an amenable number.

918999641 is a deficient number, since it is larger than the sum of its proper divisors (132109543).

918999641 is a wasteful number, since it uses less digits than its factorization.

918999641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102991.

The product of its digits is 1259712, while the sum is 56.

The square root of 918999641 is about 30315.0068612890. The cubic root of 918999641 is about 972.2361846105.

The spelling of 918999641 in words is "nine hundred eighteen million, nine hundred ninety-nine thousand, six hundred forty-one".