145820531 has 2 divisors, whose sum is σ = 145820532. Its totient is φ = 145820530.

The previous prime is 145820453. The next prime is 145820539. The reversal of 145820531 is 135028541.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 145820531 - 2¹⁰ = 145819507 is a prime.

It is a super-2 number, since 2×145820531² = 42527254522243922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 145820494 and 145820503.

It is not a weakly prime, because it can be changed into another prime (145820539) 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, 72910265 + 72910266.

It is an arithmetic number, because the mean of its divisors is an integer number (72910266).

Almost surely, 2^145820531 is an apocalyptic number.

145820531 is a deficient number, since it is larger than the sum of its proper divisors (1).

145820531 is an equidigital number, since it uses as much as digits as its factorization.

145820531 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4800, while the sum is 29.

The square root of 145820531 is about 12075.6172098986. The cubic root of 145820531 is about 526.3478966604.

The spelling of 145820531 in words is "one hundred forty-five million, eight hundred twenty thousand, five hundred thirty-one".