2190240091 has 8 divisors (see below), whose sum is σ = 2408906304. Its totient is φ = 1978743360.

The previous prime is 2190240079. The next prime is 2190240103. The reversal of 2190240091 is 1900420912.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (2190240079) and next prime (2190240103).

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 2190240091 - 2⁷ = 2190239963 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2190240061) 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, 1791730 + ... + 1792951.

It is an arithmetic number, because the mean of its divisors is an integer number (301113288).

Almost surely, 2^2190240091 is an apocalyptic number.

2190240091 is a deficient number, since it is larger than the sum of its proper divisors (218666213).

2190240091 is a wasteful number, since it uses less digits than its factorization.

2190240091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3584741.

The product of its (nonzero) digits is 1296, while the sum is 28.

The square root of 2190240091 is about 46800.0009722222. Note that the first 3 decimals coincide. The cubic root of 2190240091 is about 1298.6653147885.

The spelling of 2190240091 in words is "two billion, one hundred ninety million, two hundred forty thousand, ninety-one".