2157019 has 4 divisors (see below), whose sum is σ = 2162160. Its totient is φ = 2151880.

The previous prime is 2157017. The next prime is 2157031. The reversal of 2157019 is 9107512.

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 2157019 - 2¹ = 2157017 is a prime.

It is a super-2 number, since 2×2157019² = 9305461932722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2156984 and 2157002.

It is not an unprimeable number, because it can be changed into a prime (2157017) 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, 1879 + ... + 2800.

It is an arithmetic number, because the mean of its divisors is an integer number (540540).

2^2157019 is an apocalyptic number.

2157019 is a deficient number, since it is larger than the sum of its proper divisors (5141).

2157019 is an equidigital number, since it uses as much as digits as its factorization.

2157019 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5140.

The product of its (nonzero) digits is 630, while the sum is 25.

The square root of 2157019 is about 1468.6793387258. The cubic root of 2157019 is about 129.2065876374.

The spelling of 2157019 in words is "two million, one hundred fifty-seven thousand, nineteen".