151981864393 has 4 divisors (see below), whose sum is σ = 151983848340. Its totient is φ = 151979880448.

The previous prime is 151981864387. The next prime is 151981864403. The reversal of 151981864393 is 393468189151.

151981864393 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 60510096144 + 91471768249 = 245988^2 + 302443^2 .

It is a cyclic number.

It is not a de Polignac number, because 151981864393 - 2⁹ = 151981863881 is a prime.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (151981861393) 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 3 ways as a sum of consecutive naturals, for example, 872248 + ... + 1031881.

It is an arithmetic number, because the mean of its divisors is an integer number (37995962085).

Almost surely, 2^151981864393 is an apocalyptic number.

It is an amenable number.

151981864393 is a deficient number, since it is larger than the sum of its proper divisors (1983947).

151981864393 is an equidigital number, since it uses as much as digits as its factorization.

151981864393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1983946.

The product of its digits is 5598720, while the sum is 58.

The spelling of 151981864393 in words is "one hundred fifty-one billion, nine hundred eighty-one million, eight hundred sixty-four thousand, three hundred ninety-three".