148257581 has 2 divisors, whose sum is σ = 148257582. Its totient is φ = 148257580.

The previous prime is 148257569. The next prime is 148257601. The reversal of 148257581 is 185752841.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 105472900 + 42784681 = 10270^2 + 6541^2 .

It is an emirp because it is prime and its reverse (185752841) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 148257581 - 2¹⁸ = 147995437 is a prime.

It is a super-2 number, since 2×148257581² = 43960620647943122, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (148257521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 74128790 + 74128791.

It is an arithmetic number, because the mean of its divisors is an integer number (74128791).

Almost surely, 2^148257581 is an apocalyptic number.

It is an amenable number.

148257581 is a deficient number, since it is larger than the sum of its proper divisors (1).

148257581 is an equidigital number, since it uses as much as digits as its factorization.

148257581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 89600, while the sum is 41.

The square root of 148257581 is about 12176.1069722633. The cubic root of 148257581 is about 529.2639372913.

The spelling of 148257581 in words is "one hundred forty-eight million, two hundred fifty-seven thousand, five hundred eighty-one".