2180394551 has 16 divisors (see below), whose sum is σ = 2409458400. Its totient is φ = 1963788288.

The previous prime is 2180394539. The next prime is 2180394563. The reversal of 2180394551 is 1554930812.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (2180394539) and next prime (2180394563).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2180394551 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 (2180396551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36140 + ... + 75278.

It is an arithmetic number, because the mean of its divisors is an integer number (150591150).

Almost surely, 2^2180394551 is an apocalyptic number.

2180394551 is a deficient number, since it is larger than the sum of its proper divisors (229063849).

2180394551 is a wasteful number, since it uses less digits than its factorization.

2180394551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39298.

The product of its (nonzero) digits is 43200, while the sum is 38.

The square root of 2180394551 is about 46694.6951055471. The cubic root of 2180394551 is about 1296.7164770140.

The spelling of 2180394551 in words is "two billion, one hundred eighty million, three hundred ninety-four thousand, five hundred fifty-one".