145559231 has 2 divisors, whose sum is σ = 145559232. Its totient is φ = 145559230.

The previous prime is 145559201. The next prime is 145559243. The reversal of 145559231 is 132955541.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 145559231 - 2¹⁰ = 145558207 is a prime.

It is a super-2 number, since 2×145559231² = 42374979458622722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 145559191 and 145559200.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (145559201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72779615 + 72779616.

It is an arithmetic number, because the mean of its divisors is an integer number (72779616).

Almost surely, 2^145559231 is an apocalyptic number.

145559231 is a deficient number, since it is larger than the sum of its proper divisors (1).

145559231 is an equidigital number, since it uses as much as digits as its factorization.

145559231 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27000, while the sum is 35.

The square root of 145559231 is about 12064.7930359373. The cubic root of 145559231 is about 526.0333160429.

The spelling of 145559231 in words is "one hundred forty-five million, five hundred fifty-nine thousand, two hundred thirty-one".