2154909243 has 8 divisors (see below), whose sum is σ = 2873652048. Its totient is φ = 1436386304.

The previous prime is 2154909233. The next prime is 2154909311. The reversal of 2154909243 is 3429094512.

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 2154909243 - 2⁶ = 2154909179 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2154909233) 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, 30546 + ... + 72407.

It is an arithmetic number, because the mean of its divisors is an integer number (359206506).

Almost surely, 2^2154909243 is an apocalyptic number.

2154909243 is a deficient number, since it is larger than the sum of its proper divisors (718742805).

2154909243 is a wasteful number, since it uses less digits than its factorization.

2154909243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109933.

The product of its (nonzero) digits is 77760, while the sum is 39.

The square root of 2154909243 is about 46421.0000215420. Note that the first 4 decimals coincide. The cubic root of 2154909243 is about 1291.6444870632.

The spelling of 2154909243 in words is "two billion, one hundred fifty-four million, nine hundred nine thousand, two hundred forty-three".