158011969 has 2 divisors, whose sum is σ = 158011970. Its totient is φ = 158011968.

The previous prime is 158011963. The next prime is 158011993. The reversal of 158011969 is 969110851.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 79423744 + 78588225 = 8912^2 + 8865^2 .

It is an emirp because it is prime and its reverse (969110851) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 158011969 - 2¹³ = 158003777 is a prime.

It is a super-2 number, since 2×158011969² = 49935564694513922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (158011963) 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 as a sum of consecutive naturals, namely, 79005984 + 79005985.

It is an arithmetic number, because the mean of its divisors is an integer number (79005985).

Almost surely, 2^158011969 is an apocalyptic number.

It is an amenable number.

158011969 is a deficient number, since it is larger than the sum of its proper divisors (1).

158011969 is an equidigital number, since it uses as much as digits as its factorization.

158011969 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 19440, while the sum is 40.

The square root of 158011969 is about 12570.2811822170. The cubic root of 158011969 is about 540.6256682540.

The spelling of 158011969 in words is "one hundred fifty-eight million, eleven thousand, nine hundred sixty-nine".