148881591 has 8 divisors (see below), whose sum is σ = 220565360. Its totient is φ = 99254376.

The previous prime is 148881569. The next prime is 148881613. The reversal of 148881591 is 195188841.

148881591 is a `hidden beast` number, since 1 + 488 + 81 + 5 + 91 = 666.

It is an interprime number because it is at equal distance from previous prime (148881569) and next prime (148881613).

It is not a de Polignac number, because 148881591 - 2⁶ = 148881527 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (148881791) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2757040 + ... + 2757093.

It is an arithmetic number, because the mean of its divisors is an integer number (27570670).

Almost surely, 2^148881591 is an apocalyptic number.

148881591 is a deficient number, since it is larger than the sum of its proper divisors (71683769).

148881591 is an equidigital number, since it uses as much as digits as its factorization.

148881591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5514142 (or 5514136 counting only the distinct ones).

The product of its digits is 92160, while the sum is 45.

The square root of 148881591 is about 12201.7044301196. The cubic root of 148881591 is about 530.0054479089.

The spelling of 148881591 in words is "one hundred forty-eight million, eight hundred eighty-one thousand, five hundred ninety-one".