145531511 has 4 divisors (see below), whose sum is σ = 151858992. Its totient is φ = 139204032.

The previous prime is 145531501. The next prime is 145531523. The reversal of 145531511 is 115135541.

145531511 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 145531511 - 2¹⁸ = 145269367 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 (145531501) 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, 3163706 + ... + 3163751.

It is an arithmetic number, because the mean of its divisors is an integer number (37964748).

Almost surely, 2^145531511 is an apocalyptic number.

145531511 is a deficient number, since it is larger than the sum of its proper divisors (6327481).

145531511 is an equidigital number, since it uses as much as digits as its factorization.

145531511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6327480.

The product of its digits is 1500, while the sum is 26.

The square root of 145531511 is about 12063.6441840764. The cubic root of 145531511 is about 525.9999216894. Note that the first 4 decimals are identical.

The spelling of 145531511 in words is "one hundred forty-five million, five hundred thirty-one thousand, five hundred eleven".