2991551 has 2 divisors, whose sum is σ = 2991552. Its totient is φ = 2991550.

The previous prime is 2991523. The next prime is 2991559. The reversal of 2991551 is 1551992.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2991551 - 2¹⁰ = 2990527 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2991559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1495775 + 1495776.

It is an arithmetic number, because the mean of its divisors is an integer number (1495776).

2^2991551 is an apocalyptic number.

2991551 is a deficient number, since it is larger than the sum of its proper divisors (1).

2991551 is an equidigital number, since it uses as much as digits as its factorization.

2991551 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4050, while the sum is 32.

The square root of 2991551 is about 1729.6100716636. The cubic root of 2991551 is about 144.0894345408.

The spelling of 2991551 in words is "two million, nine hundred ninety-one thousand, five hundred fifty-one".