154198993 has 8 divisors (see below), whose sum is σ = 175828968. Its totient is φ = 133964544.

The previous prime is 154198987. The next prime is 154198999. The reversal of 154198993 is 399891451.

It is an interprime number because it is at equal distance from previous prime (154198987) and next prime (154198999).

It can be written as a sum of positive squares in 4 ways, for example, as 58491904 + 95707089 = 7648^2 + 9783^2 .

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 154198993 - 2¹³ = 154190801 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (154198999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 348646 + ... + 349087.

It is an arithmetic number, because the mean of its divisors is an integer number (21978621).

Almost surely, 2^154198993 is an apocalyptic number.

154198993 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

154198993 is a deficient number, since it is larger than the sum of its proper divisors (21629975).

154198993 is a wasteful number, since it uses less digits than its factorization.

154198993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 697763.

The product of its digits is 349920, while the sum is 49.

The square root of 154198993 is about 12417.6887140885. The cubic root of 154198993 is about 536.2416127341.

The spelling of 154198993 in words is "one hundred fifty-four million, one hundred ninety-eight thousand, nine hundred ninety-three".