148639621 has 4 divisors (see below), whose sum is σ = 160073452. Its totient is φ = 137205792.

The previous prime is 148639577. The next prime is 148639633. The reversal of 148639621 is 126936841.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 126936841 = 17 ⋅7466873.

It can be written as a sum of positive squares in 2 ways, for example, as 11492100 + 137147521 = 3390^2 + 11711^2 .

It is a cyclic number.

It is not a de Polignac number, because 148639621 - 2¹⁵ = 148606853 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (148639661) 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, 5716896 + ... + 5716921.

It is an arithmetic number, because the mean of its divisors is an integer number (40018363).

Almost surely, 2^148639621 is an apocalyptic number.

It is an amenable number.

148639621 is a deficient number, since it is larger than the sum of its proper divisors (11433831).

148639621 is a wasteful number, since it uses less digits than its factorization.

148639621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11433830.

The product of its digits is 62208, while the sum is 40.

The square root of 148639621 is about 12191.7849800593. The cubic root of 148639621 is about 529.7181615332.

The spelling of 148639621 in words is "one hundred forty-eight million, six hundred thirty-nine thousand, six hundred twenty-one".