146521481 has 4 divisors (see below), whose sum is σ = 147178752. Its totient is φ = 145864212.

The previous prime is 146521471. The next prime is 146521489. The reversal of 146521481 is 184125641.

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, and also an emirpimes, since its reverse is a distinct semiprime: 184125641 = 7 ⋅26303663.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-146521481 is a prime.

It is a super-2 number, since 2×146521481² = 42937088788866722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (146521489) 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, 328301 + ... + 328746.

It is an arithmetic number, because the mean of its divisors is an integer number (36794688).

Almost surely, 2^146521481 is an apocalyptic number.

It is an amenable number.

146521481 is a deficient number, since it is larger than the sum of its proper divisors (657271).

146521481 is an equidigital number, since it uses as much as digits as its factorization.

146521481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 657270.

The product of its digits is 7680, while the sum is 32.

The square root of 146521481 is about 12104.6057763151. The cubic root of 146521481 is about 527.1899225091.

It can be divided in two parts, 14652 and 1481, that multiplied together give a palindrome (21699612).

The spelling of 146521481 in words is "one hundred forty-six million, five hundred twenty-one thousand, four hundred eighty-one".