145431 has 24 divisors (see below), whose sum is σ = 248976. Its totient is φ = 80640.

The previous prime is 145423. The next prime is 145433. The reversal of 145431 is 134541.

145431 = T₉₀ + T₉₁ + ... + T₁₁₆.

145431 = 23² + 24² + ... + 76².

It is a happy number.

It is not a de Polignac number, because 145431 - 2³ = 145423 is a prime.

It is a super-2 number, since 2×145431² = 42300351522, which contains 22 as substring.

It is a plaindrome in base 14.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 145431.

It is not an unprimeable number, because it can be changed into a prime (145433) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1231 + ... + 1343.

It is an arithmetic number, because the mean of its divisors is an integer number (10374).

2¹⁴⁵⁴³¹ is an apocalyptic number.

145431 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

145431 is a deficient number, since it is larger than the sum of its proper divisors (103545).

145431 is a wasteful number, since it uses less digits than its factorization.

145431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143 (or 140 counting only the distinct ones).

The product of its digits is 240, while the sum is 18.

The square root of 145431 is about 381.3541660976. The cubic root of 145431 is about 52.5878800260.

Adding to 145431 its reverse (134541), we get a palindrome (279972).

It can be divided in two parts, 1454 and 31, that added together give a triangular number (1485 = T₅₄).

The spelling of 145431 in words is "one hundred forty-five thousand, four hundred thirty-one".