148421491 has 2 divisors, whose sum is σ = 148421492. Its totient is φ = 148421490.

The previous prime is 148421489. The next prime is 148421501. The reversal of 148421491 is 194124841.

It is a weak prime.

It is an emirp because it is prime and its reverse (194124841) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 148421491 - 2¹ = 148421489 is a prime.

Together with 148421489, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (148421431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 74210745 + 74210746.

It is an arithmetic number, because the mean of its divisors is an integer number (74210746).

Almost surely, 2^148421491 is an apocalyptic number.

148421491 is a deficient number, since it is larger than the sum of its proper divisors (1).

148421491 is an equidigital number, since it uses as much as digits as its factorization.

148421491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9216, while the sum is 34.

The square root of 148421491 is about 12182.8359177984. The cubic root of 148421491 is about 529.4589125967.

The spelling of 148421491 in words is "one hundred forty-eight million, four hundred twenty-one thousand, four hundred ninety-one".