145291225 has 6 divisors (see below), whose sum is σ = 180161150. Its totient is φ = 116232960.

The previous prime is 145291187. The next prime is 145291261. The reversal of 145291225 is 522192541.

It can be written as a sum of positive squares in 3 ways, for example, as 233289 + 145057936 = 483^2 + 12044^2 .

It is not a de Polignac number, because 145291225 - 2¹⁵ = 145258457 is a prime.

It is a super-2 number, since 2×145291225² = 42219080124001250, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2905800 + ... + 2905849.

Almost surely, 2^145291225 is an apocalyptic number.

It is an amenable number.

145291225 is a deficient number, since it is larger than the sum of its proper divisors (34869925).

145291225 is an equidigital number, since it uses as much as digits as its factorization.

145291225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5811659 (or 5811654 counting only the distinct ones).

The product of its digits is 7200, while the sum is 31.

The square root of 145291225 is about 12053.6809730472. The cubic root of 145291225 is about 525.7102706923.

The spelling of 145291225 in words is "one hundred forty-five million, two hundred ninety-one thousand, two hundred twenty-five".