145356581 has 8 divisors (see below), whose sum is σ = 148648824. Its totient is φ = 142084800.

The previous prime is 145356577. The next prime is 145356583. The reversal of 145356581 is 185653541.

It can be written as a sum of positive squares in 4 ways, for example, as 49140100 + 96216481 = 7010^2 + 9809^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 145356581 - 2² = 145356577 is a prime.

It is a super-2 number, since 2×145356581² = 42257071280019122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145356583) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9731 + ... + 19631.

It is an arithmetic number, because the mean of its divisors is an integer number (18581103).

Almost surely, 2^145356581 is an apocalyptic number.

It is an amenable number.

145356581 is a deficient number, since it is larger than the sum of its proper divisors (3292243).

145356581 is an equidigital number, since it uses as much as digits as its factorization.

145356581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10231.

The product of its digits is 72000, while the sum is 38.

The square root of 145356581 is about 12056.3917073061. The cubic root of 145356581 is about 525.7890852019.

The spelling of 145356581 in words is "one hundred forty-five million, three hundred fifty-six thousand, five hundred eighty-one".