145091909 has 2 divisors, whose sum is σ = 145091910. Its totient is φ = 145091908.

The previous prime is 145091861. The next prime is 145091927. The reversal of 145091909 is 909190541.

145091909 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., 124389409 + 20702500 = 11153^2 + 4550^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-145091909 is a prime.

It is equal to p_8183477 and since 145091909 and 8183477 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (145091939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72545954 + 72545955.

It is an arithmetic number, because the mean of its divisors is an integer number (72545955).

Almost surely, 2^145091909 is an apocalyptic number.

It is an amenable number.

145091909 is a deficient number, since it is larger than the sum of its proper divisors (1).

145091909 is an equidigital number, since it uses as much as digits as its factorization.

145091909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14580, while the sum is 38.

The square root of 145091909 is about 12045.4102877403. The cubic root of 145091909 is about 525.4697642664.

The spelling of 145091909 in words is "one hundred forty-five million, ninety-one thousand, nine hundred nine".