145023661 has 2 divisors, whose sum is σ = 145023662. Its totient is φ = 145023660.

The previous prime is 145023647. The next prime is 145023689. The reversal of 145023661 is 166320541.

It is an a-pointer prime, because the next prime (145023689) can be obtained adding 145023661 to its sum of digits (28).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 122877225 + 22146436 = 11085^2 + 4706^2 .

It is an emirp because it is prime and its reverse (166320541) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-145023661 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (145023761) 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, 72511830 + 72511831.

It is an arithmetic number, because the mean of its divisors is an integer number (72511831).

Almost surely, 2^145023661 is an apocalyptic number.

It is an amenable number.

145023661 is a deficient number, since it is larger than the sum of its proper divisors (1).

145023661 is an equidigital number, since it uses as much as digits as its factorization.

145023661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 145023661 is about 12042.5770082653. The cubic root of 145023661 is about 525.3873615900.

The spelling of 145023661 in words is "one hundred forty-five million, twenty-three thousand, six hundred sixty-one".