148970581 has 2 divisors, whose sum is σ = 148970582. Its totient is φ = 148970580.

The previous prime is 148970579. The next prime is 148970587. The reversal of 148970581 is 185079841.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 125641681 + 23328900 = 11209^2 + 4830^2 .

It is an emirp because it is prime and its reverse (185079841) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 148970581 - 2¹ = 148970579 is a prime.

It is a super-2 number, since 2×148970581² = 44384468006955122, which contains 22 as substring.

Together with 148970579, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (148970587) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 74485290 + 74485291.

It is an arithmetic number, because the mean of its divisors is an integer number (74485291).

Almost surely, 2^148970581 is an apocalyptic number.

It is an amenable number.

148970581 is a deficient number, since it is larger than the sum of its proper divisors (1).

148970581 is an equidigital number, since it uses as much as digits as its factorization.

148970581 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 80640, while the sum is 43.

The square root of 148970581 is about 12205.3505070522. The cubic root of 148970581 is about 530.1110257496. Note that the first 3 decimals are identical.

The spelling of 148970581 in words is "one hundred forty-eight million, nine hundred seventy thousand, five hundred eighty-one".