2051205551 has 8 divisors (see below), whose sum is σ = 2137933824. Its totient is φ = 1965762360.

The previous prime is 2051205547. The next prime is 2051205577. The reversal of 2051205551 is 1555021502.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2051205551 - 2² = 2051205547 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2051205551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2051205521) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 318011 + ... + 324396.

It is an arithmetic number, because the mean of its divisors is an integer number (267241728).

Almost surely, 2^2051205551 is an apocalyptic number.

2051205551 is a deficient number, since it is larger than the sum of its proper divisors (86728273).

2051205551 is a wasteful number, since it uses less digits than its factorization.

2051205551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 642541.

The product of its (nonzero) digits is 2500, while the sum is 26.

The square root of 2051205551 is about 45290.2368176630. The cubic root of 2051205551 is about 1270.5830606475.

The spelling of 2051205551 in words is "two billion, fifty-one million, two hundred five thousand, five hundred fifty-one".