918281819091 has 32 divisors (see below), whose sum is σ = 1547651703808. Its totient is φ = 471277388160.

The previous prime is 918281819087. The next prime is 918281819113. The reversal of 918281819091 is 190918182819.

It is not a de Polignac number, because 918281819091 - 2² = 918281819087 is a prime.

It is not an unprimeable number, because it can be changed into a prime (918281819011) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 45444895 + ... + 45465096.

It is an arithmetic number, because the mean of its divisors is an integer number (48364115744).

Almost surely, 2^918281819091 is an apocalyptic number.

918281819091 is a gapful number since it is divisible by the number (91) formed by its first and last digit.

918281819091 is a deficient number, since it is larger than the sum of its proper divisors (629369884717).

918281819091 is a wasteful number, since it uses less digits than its factorization.

918281819091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90910051.

The product of its (nonzero) digits is 746496, while the sum is 57.

The spelling of 918281819091 in words is "nine hundred eighteen billion, two hundred eighty-one million, eight hundred nineteen thousand, ninety-one".