2161278487 has 8 divisors (see below), whose sum is σ = 2182268880. Its totient is φ = 2140309440.

The previous prime is 2161278473. The next prime is 2161278499. The reversal of 2161278487 is 7848721612.

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 2161278487 - 2⁷ = 2161278359 is a prime.

It is a super-2 number, since 2×2161278487² = 9342249396738018338, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2161278787) 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, 262008 + ... + 270130.

It is an arithmetic number, because the mean of its divisors is an integer number (272783610).

Almost surely, 2^2161278487 is an apocalyptic number.

2161278487 is a deficient number, since it is larger than the sum of its proper divisors (20990393).

2161278487 is a wasteful number, since it uses less digits than its factorization.

2161278487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10673.

The product of its digits is 301056, while the sum is 46.

The square root of 2161278487 is about 46489.5524499860. The cubic root of 2161278487 is about 1292.9158023046.

The spelling of 2161278487 in words is "two billion, one hundred sixty-one million, two hundred seventy-eight thousand, four hundred eighty-seven".