2155519 has 2 divisors, whose sum is σ = 2155520. Its totient is φ = 2155518.

The previous prime is 2155513. The next prime is 2155579. The reversal of 2155519 is 9155512.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2155519 - 2³ = 2155511 is a prime.

It is a super-2 number, since 2×2155519² = 9292524318722, which contains 22 as substring.

2155519 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2155511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1077759 + 1077760.

It is an arithmetic number, because the mean of its divisors is an integer number (1077760).

2^2155519 is an apocalyptic number.

2155519 is a deficient number, since it is larger than the sum of its proper divisors (1).

2155519 is an equidigital number, since it uses as much as digits as its factorization.

2155519 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2250, while the sum is 28.

The square root of 2155519 is about 1468.1685870499. The cubic root of 2155519 is about 129.1766304257.

The spelling of 2155519 in words is "two million, one hundred fifty-five thousand, five hundred nineteen".