145535531 has 2 divisors, whose sum is σ = 145535532. Its totient is φ = 145535530.

The previous prime is 145535503. The next prime is 145535561. The reversal of 145535531 is 135535541.

It is a weak prime.

It is an emirp because it is prime and its reverse (135535541) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 145535531 - 2¹⁴ = 145519147 is a prime.

It is a super-2 number, since 2×145535531² = 42361181566903922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (145535561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72767765 + 72767766.

It is an arithmetic number, because the mean of its divisors is an integer number (72767766).

Almost surely, 2^145535531 is an apocalyptic number.

145535531 is a deficient number, since it is larger than the sum of its proper divisors (1).

145535531 is an equidigital number, since it uses as much as digits as its factorization.

145535531 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 22500, while the sum is 32.

The square root of 145535531 is about 12063.8107992458. The cubic root of 145535531 is about 526.0047648563.

The spelling of 145535531 in words is "one hundred forty-five million, five hundred thirty-five thousand, five hundred thirty-one".