145505531 has 2 divisors, whose sum is σ = 145505532. Its totient is φ = 145505530.

The previous prime is 145505527. The next prime is 145505543. The reversal of 145505531 is 135505541.

It is a weak prime.

It is an emirp because it is prime and its reverse (135505541) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 145505531 - 2² = 145505527 is a prime.

It is a super-2 number, since 2×145505531² = 42343719103183922, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 145505494 and 145505503.

It is not a weakly prime, because it can be changed into another prime (145505501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72752765 + 72752766.

It is an arithmetic number, because the mean of its divisors is an integer number (72752766).

Almost surely, 2^145505531 is an apocalyptic number.

145505531 is a deficient number, since it is larger than the sum of its proper divisors (1).

145505531 is an equidigital number, since it uses as much as digits as its factorization.

145505531 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7500, while the sum is 29.

The square root of 145505531 is about 12062.5673469623. The cubic root of 145505531 is about 525.9686196684.

The spelling of 145505531 in words is "one hundred forty-five million, five hundred five thousand, five hundred thirty-one".