2518421 has 2 divisors, whose sum is σ = 2518422. Its totient is φ = 2518420.

The previous prime is 2518391. The next prime is 2518429. The reversal of 2518421 is 1248152.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2515396 + 3025 = 1586^2 + 55^2 .

It is a cyclic number.

It is not a de Polignac number, because 2518421 - 2⁶ = 2518357 is a prime.

It is a Chen prime.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2518429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1259210 + 1259211.

It is an arithmetic number, because the mean of its divisors is an integer number (1259211).

2^2518421 is an apocalyptic number.

It is an amenable number.

2518421 is a deficient number, since it is larger than the sum of its proper divisors (1).

2518421 is an equidigital number, since it uses as much as digits as its factorization.

2518421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 640, while the sum is 23.

The square root of 2518421 is about 1586.9533704555. The cubic root of 2518421 is about 136.0534139958.

The spelling of 2518421 in words is "two million, five hundred eighteen thousand, four hundred twenty-one".