145681258 has 4 divisors (see below), whose sum is σ = 218521890. Its totient is φ = 72840628.

The previous prime is 145681253. The next prime is 145681267. The reversal of 145681258 is 852186541.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 852186541 = 5743 ⋅148387.

It can be written as a sum of positive squares in only one way, i.e., 116488849 + 29192409 = 10793^2 + 5403^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 145681258.

It is not an unprimeable number, because it can be changed into a prime (145681253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36420313 + ... + 36420316.

Almost surely, 2^145681258 is an apocalyptic number.

145681258 is a deficient number, since it is larger than the sum of its proper divisors (72840632).

145681258 is an equidigital number, since it uses as much as digits as its factorization.

145681258 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72840631.

The product of its digits is 76800, while the sum is 40.

The square root of 145681258 is about 12069.8491291316. The cubic root of 145681258 is about 526.1802718853.

The spelling of 145681258 in words is "one hundred forty-five million, six hundred eighty-one thousand, two hundred fifty-eight".