1630091 has 2 divisors, whose sum is σ = 1630092. Its totient is φ = 1630090.

The previous prime is 1630051. The next prime is 1630093. The reversal of 1630091 is 1900361.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1630091 - 2¹⁴ = 1613707 is a prime.

Together with 1630093, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1630093) 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, 815045 + 815046.

It is an arithmetic number, because the mean of its divisors is an integer number (815046).

2^1630091 is an apocalyptic number.

1630091 is a deficient number, since it is larger than the sum of its proper divisors (1).

1630091 is an equidigital number, since it uses as much as digits as its factorization.

1630091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 162, while the sum is 20.

The square root of 1630091 is about 1276.7501713335. The cubic root of 1630091 is about 117.6893822381.

The spelling of 1630091 in words is "one million, six hundred thirty thousand, ninety-one".