2005251551 has 8 divisors (see below), whose sum is σ = 2052761040. Its totient is φ = 1957781952.

The previous prime is 2005251539. The next prime is 2005251631. The reversal of 2005251551 is 1551525002.

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 2005251551 - 2¹⁸ = 2004989407 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 2005251551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2005221551) 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, 108065 + ... + 125253.

It is an arithmetic number, because the mean of its divisors is an integer number (256595130).

Almost surely, 2^2005251551 is an apocalyptic number.

2005251551 is a deficient number, since it is larger than the sum of its proper divisors (47509489).

2005251551 is a wasteful number, since it uses less digits than its factorization.

2005251551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19945.

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

The square root of 2005251551 is about 44780.0351831036. The cubic root of 2005251551 is about 1261.0228427116.

Adding to 2005251551 its reverse (1551525002), we get a palindrome (3556776553).

The spelling of 2005251551 in words is "two billion, five million, two hundred fifty-one thousand, five hundred fifty-one".