150391993 has 2 divisors, whose sum is σ = 150391994. Its totient is φ = 150391992.

The previous prime is 150391991. The next prime is 150392029. The reversal of 150391993 is 399193051.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 118548544 + 31843449 = 10888^2 + 5643^2 .

It is a cyclic number.

It is not a de Polignac number, because 150391993 - 2¹ = 150391991 is a prime.

Together with 150391991, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (150391991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 75195996 + 75195997.

It is an arithmetic number, because the mean of its divisors is an integer number (75195997).

Almost surely, 2^150391993 is an apocalyptic number.

It is an amenable number.

150391993 is a deficient number, since it is larger than the sum of its proper divisors (1).

150391993 is an equidigital number, since it uses as much as digits as its factorization.

150391993 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32805, while the sum is 40.

The square root of 150391993 is about 12263.4413196297. The cubic root of 150391993 is about 531.7917205773.

The spelling of 150391993 in words is "one hundred fifty million, three hundred ninety-one thousand, nine hundred ninety-three".