2154909242 has 16 divisors (see below), whose sum is σ = 3313035432. Its totient is φ = 1050593280.

The previous prime is 2154909233. The next prime is 2154909311. The reversal of 2154909242 is 2429094512.

It is a Cunningham number, because it is equal to 46421²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 103815721 + 2051093521 = 10189^2 + 45289^2 .

It is a junction number, because it is equal to n+sod(n) for n = 2154909196 and 2154909205.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 167048 + ... + 179484.

Almost surely, 2^2154909242 is an apocalyptic number.

2154909242 is a deficient number, since it is larger than the sum of its proper divisors (1158126190).

2154909242 is a wasteful number, since it uses less digits than its factorization.

2154909242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14593.

The product of its (nonzero) digits is 51840, while the sum is 38.

The square root of 2154909242 is about 46421.0000107710. Note that the first 4 decimals coincide. The cubic root of 2154909242 is about 1291.6444868634.

The spelling of 2154909242 in words is "two billion, one hundred fifty-four million, nine hundred nine thousand, two hundred forty-two".