2054515621 has 4 divisors (see below), whose sum is σ = 2056897152. Its totient is φ = 2052134092.

The previous prime is 2054515609. The next prime is 2054515627. The reversal of 2054515621 is 1265154502.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1265154502 = 2 ⋅632577251.

It is a cyclic number.

It is not a de Polignac number, because 2054515621 - 2²⁷ = 1920297893 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2054515627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1189471 + ... + 1191196.

It is an arithmetic number, because the mean of its divisors is an integer number (514224288).

Almost surely, 2^2054515621 is an apocalyptic number.

It is an amenable number.

2054515621 is a deficient number, since it is larger than the sum of its proper divisors (2381531).

2054515621 is an equidigital number, since it uses as much as digits as its factorization.

2054515621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2381530.

The product of its (nonzero) digits is 12000, while the sum is 31.

The square root of 2054515621 is about 45326.7649518472. The cubic root of 2054515621 is about 1271.2661481474.

The spelling of 2054515621 in words is "two billion, fifty-four million, five hundred fifteen thousand, six hundred twenty-one".