2190999291 has 8 divisors (see below), whose sum is σ = 3146050320. Its totient is φ = 1348307232.

The previous prime is 2190999247. The next prime is 2190999319. The reversal of 2190999291 is 1929990912.

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

It is not a de Polignac number, because 2190999291 - 2¹¹ = 2190997243 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2190999221) 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, 28089696 + ... + 28089773.

It is an arithmetic number, because the mean of its divisors is an integer number (393256290).

Almost surely, 2^2190999291 is an apocalyptic number.

2190999291 is a deficient number, since it is larger than the sum of its proper divisors (955051029).

2190999291 is a wasteful number, since it uses less digits than its factorization.

2190999291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56179485.

The product of its (nonzero) digits is 236196, while the sum is 51.

The square root of 2190999291 is about 46808.1113804007. Note that the first 3 decimals coincide. The cubic root of 2190999291 is about 1298.8153489961.

The spelling of 2190999291 in words is "two billion, one hundred ninety million, nine hundred ninety-nine thousand, two hundred ninety-one".