146171521 has 4 divisors (see below), whose sum is σ = 146243844. Its totient is φ = 146099200.

The previous prime is 146171483. The next prime is 146171537. The reversal of 146171521 is 125171641.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 116316225 + 29855296 = 10785^2 + 5464^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-146171521 is a prime.

It is a super-2 number, since 2×146171521² = 42732227102906882, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 146171521.

It is not an unprimeable number, because it can be changed into a prime (146171591) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33040 + ... + 37201.

It is an arithmetic number, because the mean of its divisors is an integer number (36560961).

Almost surely, 2^146171521 is an apocalyptic number.

It is an amenable number.

146171521 is a deficient number, since it is larger than the sum of its proper divisors (72323).

146171521 is an equidigital number, since it uses as much as digits as its factorization.

146171521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72322.

The product of its digits is 1680, while the sum is 28.

The square root of 146171521 is about 12090.1414797346. The cubic root of 146171521 is about 526.7698647229.

The spelling of 146171521 in words is "one hundred forty-six million, one hundred seventy-one thousand, five hundred twenty-one".