1608991542 has 24 divisors (see below), whose sum is σ = 3637720944. Its totient is φ = 513011664.

The previous prime is 1608991487. The next prime is 1608991547. The reversal of 1608991542 is 2451998061.

1608991542 is a `hidden beast` number, since 16 + 0 + 8 + 9 + 91 + 542 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1608991547) 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 11 ways as a sum of consecutive naturals, for example, 1942813 + ... + 1943640.

It is an arithmetic number, because the mean of its divisors is an integer number (151571706).

Almost surely, 2^1608991542 is an apocalyptic number.

1608991542 is an abundant number, since it is smaller than the sum of its proper divisors (2028729402).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1608991542 is a wasteful number, since it uses less digits than its factorization.

1608991542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3886484 (or 3886481 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 45.

The square root of 1608991542 is about 40112.2368112276. The cubic root of 1608991542 is about 1171.7939562343.

The spelling of 1608991542 in words is "one billion, six hundred eight million, nine hundred ninety-one thousand, five hundred forty-two".