145531431 has 16 divisors (see below), whose sum is σ = 226950400. Its totient is φ = 91914264.

The previous prime is 145531417. The next prime is 145531433. The reversal of 145531431 is 134135541.

It is a happy number.

It is not a de Polignac number, because 145531431 - 2¹³ = 145523239 is a prime.

It is a super-2 number, since 2×145531431² = 42358794817815522, which contains 22 as substring.

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

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 145531395 and 145531404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145531433) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 141331 + ... + 142356.

It is an arithmetic number, because the mean of its divisors is an integer number (14184400).

Almost surely, 2^145531431 is an apocalyptic number.

145531431 is a deficient number, since it is larger than the sum of its proper divisors (81418969).

145531431 is a wasteful number, since it uses less digits than its factorization.

145531431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 283715 (or 283709 counting only the distinct ones).

The product of its digits is 3600, while the sum is 27.

The square root of 145531431 is about 12063.6408683283. The cubic root of 145531431 is about 525.9998253070. Note that the first 3 decimals are identical.

Adding to 145531431 its reverse (134135541), we get a palindrome (279666972).

The spelling of 145531431 in words is "one hundred forty-five million, five hundred thirty-one thousand, four hundred thirty-one".