145531155 has 32 divisors (see below), whose sum is σ = 290308608. Its totient is φ = 60480000.

The previous prime is 145531153. The next prime is 145531157. The reversal of 145531155 is 551135541.

It is an interprime number because it is at equal distance from previous prime (145531153) and next prime (145531157).

It is not a de Polignac number, because 145531155 - 2¹ = 145531153 is a prime.

It is not an unprimeable number, because it can be changed into a prime (145531151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 61846 + ... + 64155.

It is an arithmetic number, because the mean of its divisors is an integer number (9072144).

Almost surely, 2^145531155 is an apocalyptic number.

145531155 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

145531155 is a deficient number, since it is larger than the sum of its proper divisors (144777453).

145531155 is a wasteful number, since it uses less digits than its factorization.

145531155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126027.

The product of its digits is 7500, while the sum is 30.

The square root of 145531155 is about 12063.6294289903. The cubic root of 145531155 is about 525.9994927877. Note that the first 3 decimals are identical.

Adding to 145531155 its reverse (551135541), we get a palindrome (696666696).

The spelling of 145531155 in words is "one hundred forty-five million, five hundred thirty-one thousand, one hundred fifty-five".