145515969 has 9 divisors (see below), whose sum is σ = 210242019. Its totient is φ = 96986520.

The previous prime is 145515949. The next prime is 145515973. The reversal of 145515969 is 969515541.

It is a happy number.

The square root of 145515969 is 12063.

It is a perfect power (a square), and thus also a powerful number.

145515969 is a `hidden beast` number, since 1 + 4 + 5 + 51 + 596 + 9 = 666.

It can be written as a sum of positive squares in only one way, i.e., 8625969 + 136890000 = 2937^2 + 11700^2 .

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 145515969 - 2²⁵ = 111961537 is a prime.

It is a super-2 number, since 2×145515969² = 42349794468017922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (145515949) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 34179 + ... + 38199.

Almost surely, 2^145515969 is an apocalyptic number.

145515969 is the 12063-rd square number.

145515969 is the 6032-nd centered octagonal number.

It is an amenable number.

145515969 is a deficient number, since it is larger than the sum of its proper divisors (64726050).

145515969 is an frugal number, since it uses more digits than its factorization.

145515969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8048 (or 4024 counting only the distinct ones).

The product of its digits is 243000, while the sum is 45.

The cubic root of 145515969 is about 525.9811963477.

It can be divided in two parts, 1455 and 15969, that added together give a square (17424 = 132²).

The spelling of 145515969 in words is "one hundred forty-five million, five hundred fifteen thousand, nine hundred sixty-nine".