1608698091 has 32 divisors (see below), whose sum is σ = 2879912448. Its totient is φ = 771402240.

The previous prime is 1608698089. The next prime is 1608698101. The reversal of 1608698091 is 1908968061.

It is not a de Polignac number, because 1608698091 - 2¹ = 1608698089 is a prime.

1608698091 is a strobogrammatic number because it is the same when read upside-down.

It is a self number, because there is not a number n which added to its sum of digits gives 1608698091.

It is not an unprimeable number, because it can be changed into a prime (1608698011) 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 in 31 ways as a sum of consecutive naturals, for example, 264846 + ... + 270851.

It is an arithmetic number, because the mean of its divisors is an integer number (89997264).

Almost surely, 2^1608698091 is an apocalyptic number.

1608698091 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1608698091 is a deficient number, since it is larger than the sum of its proper divisors (1271214357).

1608698091 is a wasteful number, since it uses less digits than its factorization.

1608698091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 535731.

The product of its (nonzero) digits is 186624, while the sum is 48.

The square root of 1608698091 is about 40108.5787706321. The cubic root of 1608698091 is about 1171.7227138844.

The spelling of 1608698091 in words is "one billion, six hundred eight million, six hundred ninety-eight thousand, ninety-one".