2991421 has 2 divisors, whose sum is σ = 2991422. Its totient is φ = 2991420.

The previous prime is 2991397. The next prime is 2991431. The reversal of 2991421 is 1241992.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2208196 + 783225 = 1486^2 + 885^2 .

It is a cyclic number.

It is not a de Polignac number, because 2991421 - 2⁷ = 2991293 is a prime.

It is a super-3 number, since 3×2991421³ = 80307086285283334383, which contains 333 as substring.

It is a Chen prime.

2991421 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 2991421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2991431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1495710 + 1495711.

It is an arithmetic number, because the mean of its divisors is an integer number (1495711).

2^2991421 is an apocalyptic number.

It is an amenable number.

2991421 is a deficient number, since it is larger than the sum of its proper divisors (1).

2991421 is an equidigital number, since it uses as much as digits as its factorization.

2991421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1296, while the sum is 28.

The square root of 2991421 is about 1729.5724905305. The cubic root of 2991421 is about 144.0873473406.

The spelling of 2991421 in words is "two million, nine hundred ninety-one thousand, four hundred twenty-one".