148517591 has 2 divisors, whose sum is σ = 148517592. Its totient is φ = 148517590.

The previous prime is 148517581. The next prime is 148517599. The reversal of 148517591 is 195715841.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (195715841) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 148517591 - 2²² = 144323287 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 (148517599) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 74258795 + 74258796.

It is an arithmetic number, because the mean of its divisors is an integer number (74258796).

Almost surely, 2^148517591 is an apocalyptic number.

148517591 is a deficient number, since it is larger than the sum of its proper divisors (1).

148517591 is an equidigital number, since it uses as much as digits as its factorization.

148517591 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 50400, while the sum is 41.

The square root of 148517591 is about 12186.7793530530. The cubic root of 148517591 is about 529.5731593580.

The spelling of 148517591 in words is "one hundred forty-eight million, five hundred seventeen thousand, five hundred ninety-one".