145513531 has 4 divisors (see below), whose sum is σ = 145571152. Its totient is φ = 145455912.

The previous prime is 145513517. The next prime is 145513553. The reversal of 145513531 is 135315541.

145513531 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 145513531 - 2⁵ = 145513499 is a prime.

It is a super-2 number, since 2×145513531² = 42348375408175922, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 145513531.

It is not an unprimeable number, because it can be changed into a prime (145513031) 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, 24840 + ... + 30133.

It is an arithmetic number, because the mean of its divisors is an integer number (36392788).

Almost surely, 2^145513531 is an apocalyptic number.

145513531 is a deficient number, since it is larger than the sum of its proper divisors (57621).

145513531 is an equidigital number, since it uses as much as digits as its factorization.

145513531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57620.

The product of its digits is 4500, while the sum is 28.

The square root of 145513531 is about 12062.8989467706. The cubic root of 145513531 is about 525.9782588709.

The spelling of 145513531 in words is "one hundred forty-five million, five hundred thirteen thousand, five hundred thirty-one".