145531456 has 28 divisors (see below), whose sum is σ = 330045568. Its totient is φ = 62370432.

The previous prime is 145531433. The next prime is 145531489. The reversal of 145531456 is 654135541.

It is a tau number, because it is divible by the number of its divisors (28).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 161976 + ... + 162871.

Almost surely, 2^145531456 is an apocalyptic number.

145531456 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

145531456 is an abundant number, since it is smaller than the sum of its proper divisors (184514112).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

145531456 is an equidigital number, since it uses as much as digits as its factorization.

145531456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 324866 (or 324856 counting only the distinct ones).

The product of its digits is 36000, while the sum is 34.

The square root of 145531456 is about 12063.6419044997. The cubic root of 145531456 is about 525.9998554265. Note that the first 3 decimals are identical.

Adding to 145531456 its reverse (654135541), we get a palindrome (799666997).

The spelling of 145531456 in words is "one hundred forty-five million, five hundred thirty-one thousand, four hundred fifty-six".