145523657 has 4 divisors (see below), whose sum is σ = 145569300. Its totient is φ = 145478016.

The previous prime is 145523647. The next prime is 145523663. The reversal of 145523657 is 756325541.

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: 756325541 = 107 ⋅7068463.

It can be written as a sum of positive squares in 2 ways, for example, as 28472896 + 117050761 = 5336^2 + 10819^2 .

It is a cyclic number.

It is not a de Polignac number, because 145523657 - 2⁸ = 145523401 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 145523657.

It is not an unprimeable number, because it can be changed into a prime (145523617) 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, 17648 + ... + 24545.

It is an arithmetic number, because the mean of its divisors is an integer number (36392325).

Almost surely, 2^145523657 is an apocalyptic number.

It is an amenable number.

145523657 is a deficient number, since it is larger than the sum of its proper divisors (45643).

145523657 is an equidigital number, since it uses as much as digits as its factorization.

145523657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45642.

The product of its digits is 126000, while the sum is 38.

The square root of 145523657 is about 12063.3186561576. The cubic root of 145523657 is about 525.9904591849.

The spelling of 145523657 in words is "one hundred forty-five million, five hundred twenty-three thousand, six hundred fifty-seven".