148615991 has 2 divisors, whose sum is σ = 148615992. Its totient is φ = 148615990.

The previous prime is 148615913. The next prime is 148616009. The reversal of 148615991 is 199516841.

It is a strong prime.

It is an emirp because it is prime and its reverse (199516841) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 148615991 - 2¹⁸ = 148353847 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (148615391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 74307995 + 74307996.

It is an arithmetic number, because the mean of its divisors is an integer number (74307996).

Almost surely, 2^148615991 is an apocalyptic number.

148615991 is a deficient number, since it is larger than the sum of its proper divisors (1).

148615991 is an equidigital number, since it uses as much as digits as its factorization.

148615991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 77760, while the sum is 44.

The square root of 148615991 is about 12190.8158463657. The cubic root of 148615991 is about 529.6900893780.

The spelling of 148615991 in words is "one hundred forty-eight million, six hundred fifteen thousand, nine hundred ninety-one".