2156945019 has 8 divisors (see below), whose sum is σ = 2877187920. Its totient is φ = 1437332736.

The previous prime is 2156944981. The next prime is 2156945029. The reversal of 2156945019 is 9105496512.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2156945019 - 2⁹ = 2156944507 is a prime.

It is a super-2 number, since 2×2156945019² = 9304823629977820722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2156945029) 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, 149614 + ... + 163395.

It is an arithmetic number, because the mean of its divisors is an integer number (359648490).

Almost surely, 2^2156945019 is an apocalyptic number.

2156945019 is a deficient number, since it is larger than the sum of its proper divisors (720242901).

2156945019 is a wasteful number, since it uses less digits than its factorization.

2156945019 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 315309.

The product of its (nonzero) digits is 97200, while the sum is 42.

The square root of 2156945019 is about 46442.9221625858. The cubic root of 2156945019 is about 1292.0511045341.

The spelling of 2156945019 in words is "two billion, one hundred fifty-six million, nine hundred forty-five thousand, nineteen".