2551601813 has 4 divisors (see below), whose sum is σ = 2551776780. Its totient is φ = 2551426848.

The previous prime is 2551601783. The next prime is 2551601839. The reversal of 2551601813 is 3181061552.

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

It can be written as a sum of positive squares in 2 ways, for example, as 643484689 + 1908117124 = 25367^2 + 43682^2 .

It is a cyclic number.

It is not a de Polignac number, because 2551601813 - 2³⁰ = 1477859989 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 2551601813.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2551607813) 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, 63398 + ... + 95511.

It is an arithmetic number, because the mean of its divisors is an integer number (637944195).

Almost surely, 2^2551601813 is an apocalyptic number.

It is an amenable number.

2551601813 is a deficient number, since it is larger than the sum of its proper divisors (174967).

2551601813 is a wasteful number, since it uses less digits than its factorization.

2551601813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174966.

The product of its (nonzero) digits is 7200, while the sum is 32.

The square root of 2551601813 is about 50513.3825139438. The cubic root of 2551601813 is about 1366.4832125422.

The spelling of 2551601813 in words is "two billion, five hundred fifty-one million, six hundred one thousand, eight hundred thirteen".