2991517 has 2 divisors, whose sum is σ = 2991518. Its totient is φ = 2991516.

The previous prime is 2991511. The next prime is 2991523. The reversal of 2991517 is 7151992.

It is a balanced prime because it is at equal distance from previous prime (2991511) and next prime (2991523).

It can be written as a sum of positive squares in only one way, i.e., 2090916 + 900601 = 1446^2 + 949^2 .

It is a cyclic number.

It is not a de Polignac number, because 2991517 - 2¹⁵ = 2958749 is a prime.

It is a super-2 number, since 2×2991517² = 17898347922578, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2991511) 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, 1495758 + 1495759.

It is an arithmetic number, because the mean of its divisors is an integer number (1495759).

2^2991517 is an apocalyptic number.

It is an amenable number.

2991517 is a deficient number, since it is larger than the sum of its proper divisors (1).

2991517 is an equidigital number, since it uses as much as digits as its factorization.

2991517 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5670, while the sum is 34.

The square root of 2991517 is about 1729.6002428307. The cubic root of 2991517 is about 144.0888886635.

The spelling of 2991517 in words is "two million, nine hundred ninety-one thousand, five hundred seventeen".