148400581 has 4 divisors (see below), whose sum is σ = 169600672. Its totient is φ = 127200492.

The previous prime is 148400563. The next prime is 148400641. The reversal of 148400581 is 185004841.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-148400581 is a prime.

It is a super-2 number, since 2×148400581² = 44045464882275122, 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 (148400381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10600035 + ... + 10600048.

It is an arithmetic number, because the mean of its divisors is an integer number (42400168).

Almost surely, 2^148400581 is an apocalyptic number.

It is an amenable number.

148400581 is a deficient number, since it is larger than the sum of its proper divisors (21200091).

148400581 is an equidigital number, since it uses as much as digits as its factorization.

148400581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21200090.

The product of its (nonzero) digits is 5120, while the sum is 31.

The square root of 148400581 is about 12181.9777129988. The cubic root of 148400581 is about 529.4340475862.

The spelling of 148400581 in words is "one hundred forty-eight million, four hundred thousand, five hundred eighty-one".