918190091 has 16 divisors (see below), whose sum is σ = 1141280448. Its totient is φ = 719280000.

The previous prime is 918190087. The next prime is 918190093. The reversal of 918190091 is 190091819.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 918190091 - 2² = 918190087 is a prime.

It is not an unprimeable number, because it can be changed into a prime (918190093) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 40760 + ... + 59141.

It is an arithmetic number, because the mean of its divisors is an integer number (71330028).

Almost surely, 2^918190091 is an apocalyptic number.

918190091 is a gapful number since it is divisible by the number (91) formed by its first and last digit.

918190091 is a deficient number, since it is larger than the sum of its proper divisors (223090357).

918190091 is a wasteful number, since it uses less digits than its factorization.

918190091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100022.

The product of its (nonzero) digits is 5832, while the sum is 38.

The square root of 918190091 is about 30301.6516216526. The cubic root of 918190091 is about 971.9506186562.

The spelling of 918190091 in words is "nine hundred eighteen million, one hundred ninety thousand, ninety-one".