145259581 has 2 divisors, whose sum is σ = 145259582. Its totient is φ = 145259580.

The previous prime is 145259573. The next prime is 145259599. The reversal of 145259581 is 185952541.

145259581 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 142420356 + 2839225 = 11934^2 + 1685^2 .

It is an emirp because it is prime and its reverse (185952541) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 145259581 - 2³ = 145259573 is a prime.

It is a super-2 number, since 2×145259581² = 42200691744591122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (145259531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72629790 + 72629791.

It is an arithmetic number, because the mean of its divisors is an integer number (72629791).

Almost surely, 2^145259581 is an apocalyptic number.

It is an amenable number.

145259581 is a deficient number, since it is larger than the sum of its proper divisors (1).

145259581 is an equidigital number, since it uses as much as digits as its factorization.

145259581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 72000, while the sum is 40.

The square root of 145259581 is about 12052.3682734971. The cubic root of 145259581 is about 525.6721018726.

The spelling of 145259581 in words is "one hundred forty-five million, two hundred fifty-nine thousand, five hundred eighty-one".