2051551401 has 24 divisors (see below), whose sum is σ = 2913575616. Its totient is φ = 1283499360.

The previous prime is 2051551367. The next prime is 2051551423. The reversal of 2051551401 is 1041551502.

It is not a de Polignac number, because 2051551401 - 2¹⁰ = 2051550377 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2051551441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 71916 + ... + 96306.

It is an arithmetic number, because the mean of its divisors is an integer number (121398984).

Almost surely, 2^2051551401 is an apocalyptic number.

It is an amenable number.

2051551401 is a deficient number, since it is larger than the sum of its proper divisors (862024215).

2051551401 is a wasteful number, since it uses less digits than its factorization.

2051551401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24493 (or 24470 counting only the distinct ones).

The product of its (nonzero) digits is 1000, while the sum is 24.

The square root of 2051551401 is about 45294.0548085508. The cubic root of 2051551401 is about 1270.6544668598.

The spelling of 2051551401 in words is "two billion, fifty-one million, five hundred fifty-one thousand, four hundred one".