148737581 has 4 divisors (see below), whose sum is σ = 151175964. Its totient is φ = 146299200.

The previous prime is 148737571. The next prime is 148737599. The reversal of 148737581 is 185737841.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 185737841 = 59 ⋅3148099.

It can be written as a sum of positive squares in 2 ways, for example, as 84015556 + 64722025 = 9166^2 + 8045^2 .

It is a cyclic number.

It is not a de Polignac number, because 148737581 - 2⁶ = 148737517 is a prime.

It is a super-2 number, since 2×148737581² = 44245736003463122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (148737551) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1219100 + ... + 1219221.

It is an arithmetic number, because the mean of its divisors is an integer number (37793991).

Almost surely, 2^148737581 is an apocalyptic number.

It is an amenable number.

148737581 is a deficient number, since it is larger than the sum of its proper divisors (2438383).

148737581 is an equidigital number, since it uses as much as digits as its factorization.

148737581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2438382.

The product of its digits is 188160, while the sum is 44.

The square root of 148737581 is about 12195.8017776610. The cubic root of 148737581 is about 529.8345051106.

The spelling of 148737581 in words is "one hundred forty-eight million, seven hundred thirty-seven thousand, five hundred eighty-one".