2051641521 has 16 divisors (see below), whose sum is σ = 3048192000. Its totient is φ = 1363835664.

The previous prime is 2051641507. The next prime is 2051641523. The reversal of 2051641521 is 1251461502.

It is not a de Polignac number, because 2051641521 - 2¹⁴ = 2051625137 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2051641523) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 99441 + ... + 118286.

It is an arithmetic number, because the mean of its divisors is an integer number (190512000).

Almost surely, 2^2051641521 is an apocalyptic number.

It is an amenable number.

2051641521 is a deficient number, since it is larger than the sum of its proper divisors (996550479).

2051641521 is a wasteful number, since it uses less digits than its factorization.

2051641521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 218085 (or 218079 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 27.

The square root of 2051641521 is about 45295.0496301748. The cubic root of 2051641521 is about 1270.6730722436.

The spelling of 2051641521 in words is "two billion, fifty-one million, six hundred forty-one thousand, five hundred twenty-one".