154161993 has 8 divisors (see below), whose sum is σ = 205610400. Its totient is φ = 102744128.

The previous prime is 154161983. The next prime is 154162007. The reversal of 154161993 is 399161451.

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

It is a cyclic number.

It is not a de Polignac number, because 154161993 - 2⁵ = 154161961 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (154161913) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9898 + ... + 20156.

It is an arithmetic number, because the mean of its divisors is an integer number (25701300).

Almost surely, 2^154161993 is an apocalyptic number.

It is an amenable number.

154161993 is a deficient number, since it is larger than the sum of its proper divisors (51448407).

154161993 is a wasteful number, since it uses less digits than its factorization.

154161993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15271.

The product of its digits is 29160, while the sum is 39.

The square root of 154161993 is about 12416.1988144520. The cubic root of 154161993 is about 536.1987189675.

The spelling of 154161993 in words is "one hundred fifty-four million, one hundred sixty-one thousand, nine hundred ninety-three".