145515251 has 6 divisors (see below), whose sum is σ = 169272900. Its totient is φ = 124727316.

The previous prime is 145515241. The next prime is 145515259. The reversal of 145515251 is 152515541.

145515251 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 145515251 - 2¹⁰ = 145514227 is a prime.

It is a Duffinian 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, 1484801 + ... + 1484898.

It is an arithmetic number, because the mean of its divisors is an integer number (28212150).

Almost surely, 2^145515251 is an apocalyptic number.

145515251 is a deficient number, since it is larger than the sum of its proper divisors (23757649).

145515251 is an equidigital number, since it uses as much as digits as its factorization.

145515251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2969713 (or 2969706 counting only the distinct ones).

The product of its digits is 5000, while the sum is 29.

The square root of 145515251 is about 12062.9702395389. The cubic root of 145515251 is about 525.9803312533.

The spelling of 145515251 in words is "one hundred forty-five million, five hundred fifteen thousand, two hundred fifty-one".