2091699437 has 2 divisors, whose sum is σ = 2091699438. Its totient is φ = 2091699436.

The previous prime is 2091699413. The next prime is 2091699473. The reversal of 2091699437 is 7349961902.

Together with next prime (2091699473) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1420837636 + 670861801 = 37694^2 + 25901^2 .

It is a cyclic number.

It is not a de Polignac number, because 2091699437 - 2¹⁴ = 2091683053 is a prime.

It is a super-2 number, since 2×2091699437² = 8750413069492233938, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2091699497) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1045849718 + 1045849719.

It is an arithmetic number, because the mean of its divisors is an integer number (1045849719).

Almost surely, 2^2091699437 is an apocalyptic number.

It is an amenable number.

2091699437 is a deficient number, since it is larger than the sum of its proper divisors (1).

2091699437 is an equidigital number, since it uses as much as digits as its factorization.

2091699437 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 734832, while the sum is 50.

The square root of 2091699437 is about 45735.1007105046. The cubic root of 2091699437 is about 1278.8897104158.

The spelling of 2091699437 in words is "two billion, ninety-one million, six hundred ninety-nine thousand, four hundred thirty-seven".