2051510551 has 4 divisors (see below), whose sum is σ = 2051876104. Its totient is φ = 2051145000.

The previous prime is 2051510543. The next prime is 2051510569. The reversal of 2051510551 is 1550151502.

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

It is a cyclic number.

It is not a de Polignac number, because 2051510551 - 2³ = 2051510543 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 (2051510501) 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, 174225 + ... + 185626.

It is an arithmetic number, because the mean of its divisors is an integer number (512969026).

Almost surely, 2^2051510551 is an apocalyptic number.

2051510551 is a deficient number, since it is larger than the sum of its proper divisors (365553).

2051510551 is an equidigital number, since it uses as much as digits as its factorization.

2051510551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 365552.

The product of its (nonzero) digits is 1250, while the sum is 25.

The square root of 2051510551 is about 45293.6038641219. The cubic root of 2051510551 is about 1270.6460331480.

The spelling of 2051510551 in words is "two billion, fifty-one million, five hundred ten thousand, five hundred fifty-one".