145615945 has 4 divisors (see below), whose sum is σ = 174739140. Its totient is φ = 116492752.

The previous prime is 145615927. The next prime is 145615957. The reversal of 145615945 is 549516541.

It is a happy number.

145615945 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 549516541 = 7 ⋅78502363.

It can be written as a sum of positive squares in 2 ways, for example, as 61214976 + 84400969 = 7824^2 + 9187^2 .

It is a cyclic number.

It is not a de Polignac number, because 145615945 - 2²⁵ = 112061513 is a prime.

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 junction number, because it is equal to n+sod(n) for n = 145615898 and 145615907.

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, 14561590 + ... + 14561599.

It is an arithmetic number, because the mean of its divisors is an integer number (43684785).

Almost surely, 2^145615945 is an apocalyptic number.

It is an amenable number.

145615945 is a deficient number, since it is larger than the sum of its proper divisors (29123195).

145615945 is an equidigital number, since it uses as much as digits as its factorization.

145615945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29123194.

The product of its digits is 108000, while the sum is 40.

The square root of 145615945 is about 12067.1431996144. The cubic root of 145615945 is about 526.1016263325.

The spelling of 145615945 in words is "one hundred forty-five million, six hundred fifteen thousand, nine hundred forty-five".