145804781 has 2 divisors, whose sum is σ = 145804782. Its totient is φ = 145804780.

The previous prime is 145804741. The next prime is 145804783. The reversal of 145804781 is 187408541.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 111112681 + 34692100 = 10541^2 + 5890^2 .

It is an emirp because it is prime and its reverse (187408541) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 145804781 - 2¹⁴ = 145788397 is a prime.

It is a super-2 number, since 2×145804781² = 42518068324915922, which contains 22 as substring.

Together with 145804783, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (145804783) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72902390 + 72902391.

It is an arithmetic number, because the mean of its divisors is an integer number (72902391).

Almost surely, 2^145804781 is an apocalyptic number.

It is an amenable number.

145804781 is a deficient number, since it is larger than the sum of its proper divisors (1).

145804781 is an equidigital number, since it uses as much as digits as its factorization.

145804781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 35840, while the sum is 38.

The square root of 145804781 is about 12074.9650517093. The cubic root of 145804781 is about 526.3289457903.

The spelling of 145804781 in words is "one hundred forty-five million, eight hundred four thousand, seven hundred eighty-one".