145515253 has 6 divisors (see below), whose sum is σ = 157569954. Its totient is φ = 134321616.

The previous prime is 145515241. The next prime is 145515259. The reversal of 145515253 is 352515541.

145515253 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 3 ways, for example, as 23409 + 145491844 = 153^2 + 12062^2 .

It is not a de Polignac number, because 145515253 - 2⁵ = 145515221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145515259) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 430350 + ... + 430687.

It is an arithmetic number, because the mean of its divisors is an integer number (26261659).

Almost surely, 2^145515253 is an apocalyptic number.

145515253 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

145515253 is a deficient number, since it is larger than the sum of its proper divisors (12054701).

145515253 is an equidigital number, since it uses as much as digits as its factorization.

145515253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 861063 (or 861050 counting only the distinct ones).

The product of its digits is 15000, while the sum is 31.

The square root of 145515253 is about 12062.9703224372. The cubic root of 145515253 is about 525.9803336631.

The spelling of 145515253 in words is "one hundred forty-five million, five hundred fifteen thousand, two hundred fifty-three".