1601914891 has 2 divisors, whose sum is σ = 1601914892. Its totient is φ = 1601914890.

The previous prime is 1601914829. The next prime is 1601914901. The reversal of 1601914891 is 1984191061.

It is a strong prime.

It is an emirp because it is prime and its reverse (1984191061) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1601914891 - 2⁷ = 1601914763 is a prime.

It is a super-2 number, since 2×1601914891² = 5132262636015083762, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1601914091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 800957445 + 800957446.

It is an arithmetic number, because the mean of its divisors is an integer number (800957446).

Almost surely, 2^1601914891 is an apocalyptic number.

1601914891 is a deficient number, since it is larger than the sum of its proper divisors (1).

1601914891 is an equidigital number, since it uses as much as digits as its factorization.

1601914891 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15552, while the sum is 40.

The square root of 1601914891 is about 40023.9289800489. The cubic root of 1601914891 is about 1170.0735072038.

The spelling of 1601914891 in words is "one billion, six hundred one million, nine hundred fourteen thousand, eight hundred ninety-one".