158011993 has 2 divisors, whose sum is σ = 158011994. Its totient is φ = 158011992.

The previous prime is 158011969. The next prime is 158012011. The reversal of 158011993 is 399110851.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 128981449 + 29030544 = 11357^2 + 5388^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-158011993 is a prime.

It is not a weakly prime, because it can be changed into another prime (158011913) 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 as a sum of consecutive naturals, namely, 79005996 + 79005997.

It is an arithmetic number, because the mean of its divisors is an integer number (79005997).

Almost surely, 2^158011993 is an apocalyptic number.

It is an amenable number.

158011993 is a deficient number, since it is larger than the sum of its proper divisors (1).

158011993 is an equidigital number, since it uses as much as digits as its factorization.

158011993 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9720, while the sum is 37.

The square root of 158011993 is about 12570.2821368496. The cubic root of 158011993 is about 540.6256956254.

The spelling of 158011993 in words is "one hundred fifty-eight million, eleven thousand, nine hundred ninety-three".