145512531 has 12 divisors (see below), whose sum is σ = 217969752. Its totient is φ = 97008192.

The previous prime is 145512457. The next prime is 145512533. The reversal of 145512531 is 135215541.

145512531 is a `hidden beast` number, since 145 + 512 + 5 + 3 + 1 = 666.

It is not a de Polignac number, because 145512531 - 2⁹ = 145512019 is a prime.

It is a super-2 number, since 2×145512531² = 42347793356051922, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 145512495 and 145512504.

It is not an unprimeable number, because it can be changed into a prime (145512533) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 299166 + ... + 299651.

It is an arithmetic number, because the mean of its divisors is an integer number (18164146).

Almost surely, 2^145512531 is an apocalyptic number.

145512531 is a deficient number, since it is larger than the sum of its proper divisors (72457221).

145512531 is an frugal number, since it uses more digits than its factorization.

145512531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 598832 (or 598820 counting only the distinct ones).

The product of its digits is 3000, while the sum is 27.

The square root of 145512531 is about 12062.8574972931. The cubic root of 145512531 is about 525.9770539899.

The spelling of 145512531 in words is "one hundred forty-five million, five hundred twelve thousand, five hundred thirty-one".