148571721 has 27 divisors (see below), whose sum is σ = 228927751. Its totient is φ = 92831424.

The previous prime is 148571719. The next prime is 148571723. The reversal of 148571721 is 127175841.

The square root of 148571721 is 12189.

It is a perfect power (a square), and thus also a powerful number.

148571721 is a `hidden beast` number, since 1 + 485 + 7 + 172 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (148571719) and next prime (148571723).

It can be written as a sum of positive squares in only one way, i.e., 115670025 + 32901696 = 10755^2 + 5736^2 .

It is not a de Polignac number, because 148571721 - 2¹ = 148571719 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (148571723) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 621520 + ... + 621758.

Almost surely, 2^148571721 is an apocalyptic number.

148571721 is the 12189-th square number.

148571721 is the 6095-th centered octagonal number.

It is an amenable number.

148571721 is a deficient number, since it is larger than the sum of its proper divisors (80356030).

148571721 is an equidigital number, since it uses as much as digits as its factorization.

148571721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 518 (or 259 counting only the distinct ones).

The product of its digits is 15680, while the sum is 36.

The cubic root of 148571721 is about 529.6374891411.

Multiplying 148571721 by its sum of digits (36), we get a square (5348581956 = 73134²).

The spelling of 148571721 in words is "one hundred forty-eight million, five hundred seventy-one thousand, seven hundred twenty-one".