145781761 has 2 divisors, whose sum is σ = 145781762. Its totient is φ = 145781760.

The previous prime is 145781759. The next prime is 145781767. The reversal of 145781761 is 167187541.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 100300225 + 45481536 = 10015^2 + 6744^2 .

It is a cyclic number.

It is not a de Polignac number, because 145781761 - 2¹ = 145781759 is a prime.

It is a super-2 number, since 2×145781761² = 42504643680522242, which contains 22 as substring.

Together with 145781759, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (145781767) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72890880 + 72890881.

It is an arithmetic number, because the mean of its divisors is an integer number (72890881).

Almost surely, 2^145781761 is an apocalyptic number.

It is an amenable number.

145781761 is a deficient number, since it is larger than the sum of its proper divisors (1).

145781761 is an equidigital number, since it uses as much as digits as its factorization.

145781761 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 47040, while the sum is 40.

The square root of 145781761 is about 12074.0118022139. The cubic root of 145781761 is about 526.3012449839.

The spelling of 145781761 in words is "one hundred forty-five million, seven hundred eighty-one thousand, seven hundred sixty-one".