145231145 has 4 divisors (see below), whose sum is σ = 174277380. Its totient is φ = 116184912.

The previous prime is 145231111. The next prime is 145231147. The reversal of 145231145 is 541132541.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 18983449 + 126247696 = 4357^2 + 11236^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-145231145 is a prime.

It is a super-2 number, since 2×145231145² = 42184170956022050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (145231147) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14523110 + ... + 14523119.

It is an arithmetic number, because the mean of its divisors is an integer number (43569345).

Almost surely, 2^145231145 is an apocalyptic number.

It is an amenable number.

145231145 is a deficient number, since it is larger than the sum of its proper divisors (29046235).

145231145 is an equidigital number, since it uses as much as digits as its factorization.

145231145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29046234.

The product of its digits is 2400, while the sum is 26.

The square root of 145231145 is about 12051.1885305973. The cubic root of 145231145 is about 525.6377977960.

Adding to 145231145 its reverse (541132541), we get a palindrome (686363686).

The spelling of 145231145 in words is "one hundred forty-five million, two hundred thirty-one thousand, one hundred forty-five".