148749721 has 2 divisors, whose sum is σ = 148749722. Its totient is φ = 148749720.

The previous prime is 148749719. The next prime is 148749817. The reversal of 148749721 is 127947841.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 143161225 + 5588496 = 11965^2 + 2364^2 .

It is a cyclic number.

It is not a de Polignac number, because 148749721 - 2¹ = 148749719 is a prime.

Together with 148749719, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (148749701) 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, 74374860 + 74374861.

It is an arithmetic number, because the mean of its divisors is an integer number (74374861).

Almost surely, 2^148749721 is an apocalyptic number.

It is an amenable number.

148749721 is a deficient number, since it is larger than the sum of its proper divisors (1).

148749721 is an equidigital number, since it uses as much as digits as its factorization.

148749721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 112896, while the sum is 43.

The square root of 148749721 is about 12196.2994797602. The cubic root of 148749721 is about 529.8489197951.

The spelling of 148749721 in words is "one hundred forty-eight million, seven hundred forty-nine thousand, seven hundred twenty-one".