16991542 has 8 divisors (see below), whose sum is σ = 25520616. Its totient is φ = 8484672.

The previous prime is 16991537. The next prime is 16991561. The reversal of 16991542 is 24519961.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3483 + ... + 6790.

It is an arithmetic number, because the mean of its divisors is an integer number (3190077).

Almost surely, 2^16991542 is an apocalyptic number.

16991542 is a deficient number, since it is larger than the sum of its proper divisors (8529074).

16991542 is a wasteful number, since it uses less digits than its factorization.

16991542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11102.

The product of its digits is 19440, while the sum is 37.

The square root of 16991542 is about 4122.0798148508. The cubic root of 16991542 is about 257.0855090513.

The spelling of 16991542 in words is "sixteen million, nine hundred ninety-one thousand, five hundred forty-two".