148991 has 2 divisors, whose sum is σ = 148992. Its totient is φ = 148990.

The previous prime is 148961. The next prime is 148997. The reversal of 148991 is 199841.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 148991 - 2⁶ = 148927 is a prime.

It is a plaindrome in base 16.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (148997) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 74495 + 74496.

It is an arithmetic number, because the mean of its divisors is an integer number (74496).

2¹⁴⁸⁹⁹¹ is an apocalyptic number.

148991 is a deficient number, since it is larger than the sum of its proper divisors (1).

148991 is an equidigital number, since it uses as much as digits as its factorization.

148991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2592, while the sum is 32.

The square root of 148991 is about 385.9935232617. The cubic root of 148991 is about 53.0135244944.

The spelling of 148991 in words is "one hundred forty-eight thousand, nine hundred ninety-one".