20151055049 has 4 divisors (see below), whose sum is σ = 20214623364. Its totient is φ = 20087486736.

The previous prime is 20151055039. The next prime is 20151055063. The reversal of 20151055049 is 94055015102.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3717097024 + 16433958025 = 60968^2 + 128195^2 .

It is a cyclic number.

It is not a de Polignac number, because 20151055049 - 2²⁸ = 19882619593 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20151055039) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31783682 + ... + 31784315.

It is an arithmetic number, because the mean of its divisors is an integer number (5053655841).

Almost surely, 2^20151055049 is an apocalyptic number.

It is an amenable number.

20151055049 is a deficient number, since it is larger than the sum of its proper divisors (63568315).

20151055049 is an equidigital number, since it uses as much as digits as its factorization.

20151055049 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63568314.

The product of its (nonzero) digits is 9000, while the sum is 32.

The spelling of 20151055049 in words is "twenty billion, one hundred fifty-one million, fifty-five thousand, forty-nine".