145366531531 has 24 divisors (see below), whose sum is σ = 166648245120. Its totient is φ = 126026068992.

The previous prime is 145366531529. The next prime is 145366531561. The reversal of 145366531531 is 135135663541.

It is a happy number.

145366531531 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 145366531531 - 2¹ = 145366531529 is a prime.

It is a super-2 number, since 2×145366531531² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (145366531561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1759215 + ... + 1839991.

It is an arithmetic number, because the mean of its divisors is an integer number (6943676880).

Almost surely, 2^145366531531 is an apocalyptic number.

145366531531 is a deficient number, since it is larger than the sum of its proper divisors (21281713589).

145366531531 is a wasteful number, since it uses less digits than its factorization.

145366531531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81303 (or 81286 counting only the distinct ones).

The product of its digits is 486000, while the sum is 43.

The spelling of 145366531531 in words is "one hundred forty-five billion, three hundred sixty-six million, five hundred thirty-one thousand, five hundred thirty-one".