145431531 has 20 divisors (see below), whose sum is σ = 248286192. Its totient is φ = 83103408.

The previous prime is 145431527. The next prime is 145431557. The reversal of 145431531 is 135134541.

It is a happy number.

It is not a de Polignac number, because 145431531 - 2² = 145431527 is a prime.

It is a super-2 number, since 2×145431531² = 42300660418007922, 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 = 145431495 and 145431504.

It is not an unprimeable number, because it can be changed into a prime (145431131) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 127680 + ... + 128813.

Almost surely, 2^145431531 is an apocalyptic number.

145431531 is a deficient number, since it is larger than the sum of its proper divisors (102854661).

145431531 is an equidigital number, since it uses as much as digits as its factorization.

145431531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 256512 (or 256503 counting only the distinct ones).

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

The square root of 145431531 is about 12059.4996164849. The cubic root of 145431531 is about 525.8794402913.

The spelling of 145431531 in words is "one hundred forty-five million, four hundred thirty-one thousand, five hundred thirty-one".