2521919 has 2 divisors, whose sum is σ = 2521920. Its totient is φ = 2521918.

The previous prime is 2521901. The next prime is 2521921. The reversal of 2521919 is 9191252.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2521919 - 2¹⁶ = 2456383 is a prime.

It is a super-2 number, since 2×2521919² = 12720150885122, which contains 22 as substring.

Together with 2521921, it forms a pair of twin primes.

It is a Chen prime.

It is equal to p₁₈₄₅₄₇ and since 2521919 and 184547 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 2521891 and 2521900.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2521949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1260959 + 1260960.

It is an arithmetic number, because the mean of its divisors is an integer number (1260960).

2^2521919 is an apocalyptic number.

2521919 is a deficient number, since it is larger than the sum of its proper divisors (1).

2521919 is an equidigital number, since it uses as much as digits as its factorization.

2521919 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1620, while the sum is 29.

The square root of 2521919 is about 1588.0550997998. The cubic root of 2521919 is about 136.1163760223.

The spelling of 2521919 in words is "two million, five hundred twenty-one thousand, nine hundred nineteen".