150181991 has 2 divisors, whose sum is σ = 150181992. Its totient is φ = 150181990.

The previous prime is 150181979. The next prime is 150182009. The reversal of 150181991 is 199181051.

It is a weak prime.

It is an emirp because it is prime and its reverse (199181051) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-150181991 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (150181901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 75090995 + 75090996.

It is an arithmetic number, because the mean of its divisors is an integer number (75090996).

Almost surely, 2^150181991 is an apocalyptic number.

150181991 is a deficient number, since it is larger than the sum of its proper divisors (1).

150181991 is an equidigital number, since it uses as much as digits as its factorization.

150181991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3240, while the sum is 35.

The square root of 150181991 is about 12254.8762131651. The cubic root of 150181991 is about 531.5440802968.

The spelling of 150181991 in words is "one hundred fifty million, one hundred eighty-one thousand, nine hundred ninety-one".