2151019 has 4 divisors (see below), whose sum is σ = 2316496. Its totient is φ = 1985544.

The previous prime is 2151013. The next prime is 2151031. The reversal of 2151019 is 9101512.

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

It is a cyclic number.

It is not a de Polignac number, because 2151019 - 2³ = 2151011 is a prime.

It is a super-2 number, since 2×2151019² = 9253765476722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2150987 and 2151005.

It is not an unprimeable number, because it can be changed into a prime (2151011) 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, 82719 + ... + 82744.

It is an arithmetic number, because the mean of its divisors is an integer number (579124).

2^2151019 is an apocalyptic number.

2151019 is a deficient number, since it is larger than the sum of its proper divisors (165477).

2151019 is a wasteful number, since it uses less digits than its factorization.

2151019 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165476.

The product of its (nonzero) digits is 90, while the sum is 19.

The square root of 2151019 is about 1466.6352648154. The cubic root of 2151019 is about 129.0866753194.

It can be divided in two parts, 21 and 51019, that added together give a triangular number (51040 = T₃₁₉).

The spelling of 2151019 in words is "two million, one hundred fifty-one thousand, nineteen".