145411781 has 2 divisors, whose sum is σ = 145411782. Its totient is φ = 145411780.

The previous prime is 145411759. The next prime is 145411801. The reversal of 145411781 is 187114541.

145411781 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 136656100 + 8755681 = 11690^2 + 2959^2 .

It is a cyclic number.

It is not a de Polignac number, because 145411781 - 2¹⁰ = 145410757 is a prime.

It is a super-2 number, since 2×145411781² = 42289172107183922, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (145411741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72705890 + 72705891.

It is an arithmetic number, because the mean of its divisors is an integer number (72705891).

Almost surely, 2^145411781 is an apocalyptic number.

It is an amenable number.

145411781 is a deficient number, since it is larger than the sum of its proper divisors (1).

145411781 is an equidigital number, since it uses as much as digits as its factorization.

145411781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4480, while the sum is 32.

The square root of 145411781 is about 12058.6807321531. The cubic root of 145411781 is about 525.8556339244.

The spelling of 145411781 in words is "one hundred forty-five million, four hundred eleven thousand, seven hundred eighty-one".