1651606091 has 2 divisors, whose sum is σ = 1651606092. Its totient is φ = 1651606090.

The previous prime is 1651606081. The next prime is 1651606109. The reversal of 1651606091 is 1906061561.

Together with next prime (1651606109) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is an emirp because it is prime and its reverse (1906061561) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1651606091 - 2³⁰ = 577864267 is a prime.

It is not a weakly prime, because it can be changed into another prime (1651606031) 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, 825803045 + 825803046.

It is an arithmetic number, because the mean of its divisors is an integer number (825803046).

Almost surely, 2^1651606091 is an apocalyptic number.

1651606091 is a deficient number, since it is larger than the sum of its proper divisors (1).

1651606091 is an equidigital number, since it uses as much as digits as its factorization.

1651606091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9720, while the sum is 35.

The square root of 1651606091 is about 40639.9568282251. The cubic root of 1651606091 is about 1182.0490327450.

The spelling of 1651606091 in words is "one billion, six hundred fifty-one million, six hundred six thousand, ninety-one".