148817989 has 2 divisors, whose sum is σ = 148817990. Its totient is φ = 148817988.

The previous prime is 148817957. The next prime is 148818023. The reversal of 148817989 is 989718841.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 122213025 + 26604964 = 11055^2 + 5158^2 .

It is a cyclic number.

It is not a de Polignac number, because 148817989 - 2⁵ = 148817957 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (148817189) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 74408994 + 74408995.

It is an arithmetic number, because the mean of its divisors is an integer number (74408995).

Almost surely, 2^148817989 is an apocalyptic number.

It is an amenable number.

148817989 is a deficient number, since it is larger than the sum of its proper divisors (1).

148817989 is an equidigital number, since it uses as much as digits as its factorization.

148817989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1161216, while the sum is 55.

The square root of 148817989 is about 12199.0978764825. The cubic root of 148817989 is about 529.9299646392.

The spelling of 148817989 in words is "one hundred forty-eight million, eight hundred seventeen thousand, nine hundred eighty-nine".