1616969191 has 2 divisors, whose sum is σ = 1616969192. Its totient is φ = 1616969190.

The previous prime is 1616969183. The next prime is 1616969201. The reversal of 1616969191 is 1919696161.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1616969191 - 2³ = 1616969183 is a prime.

It is a super-2 number, since 2×1616969191² = 5229178729286388962, which contains 22 as substring.

1616969191 is a strobogrammatic number because it is the same when read upside-down.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1616969131) 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, 808484595 + 808484596.

It is an arithmetic number, because the mean of its divisors is an integer number (808484596).

Almost surely, 2^1616969191 is an apocalyptic number.

1616969191 is a deficient number, since it is larger than the sum of its proper divisors (1).

1616969191 is an equidigital number, since it uses as much as digits as its factorization.

1616969191 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 157464, while the sum is 49.

The square root of 1616969191 is about 40211.5554411913. Note that the first 3 decimals coincide. The cubic root of 1616969191 is about 1173.7274143750.

The spelling of 1616969191 in words is "one billion, six hundred sixteen million, nine hundred sixty-nine thousand, one hundred ninety-one".