145042531 has 4 divisors (see below), whose sum is σ = 151348752. Its totient is φ = 138736312.

The previous prime is 145042529. The next prime is 145042549. The reversal of 145042531 is 135240541.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 135240541 = 277 ⋅488233.

It is a cyclic number.

It is not a de Polignac number, because 145042531 - 2¹ = 145042529 is a prime.

It is a super-2 number, since 2×145042531² = 42074671597771922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 145042496 and 145042505.

It is not an unprimeable number, because it can be changed into a prime (145040531) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3153076 + ... + 3153121.

It is an arithmetic number, because the mean of its divisors is an integer number (37837188).

Almost surely, 2^145042531 is an apocalyptic number.

145042531 is a deficient number, since it is larger than the sum of its proper divisors (6306221).

145042531 is an equidigital number, since it uses as much as digits as its factorization.

145042531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6306220.

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 145042531 is about 12043.3604529633. The cubic root of 145042531 is about 525.4101478247.

The spelling of 145042531 in words is "one hundred forty-five million, forty-two thousand, five hundred thirty-one".