148387581 has 6 divisors (see below), whose sum is σ = 214337630. Its totient is φ = 98925048.

The previous prime is 148387571. The next prime is 148387609. The reversal of 148387581 is 185783841.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 126765081 + 21622500 = 11259^2 + 4650^2 .

It is not a de Polignac number, because 148387581 - 2¹⁵ = 148354813 is a prime.

It is a super-2 number, since 2×148387581² = 44037748390063122, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (148387531) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8243746 + ... + 8243763.

Almost surely, 2^148387581 is an apocalyptic number.

It is an amenable number.

148387581 is a deficient number, since it is larger than the sum of its proper divisors (65950049).

148387581 is a wasteful number, since it uses less digits than its factorization.

148387581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16487515 (or 16487512 counting only the distinct ones).

The product of its digits is 215040, while the sum is 45.

The square root of 148387581 is about 12181.4441262110. Note that the first 3 decimals coincide. The cubic root of 148387581 is about 529.4185875308.

The spelling of 148387581 in words is "one hundred forty-eight million, three hundred eighty-seven thousand, five hundred eighty-one".