145220849 has 2 divisors, whose sum is σ = 145220850. Its totient is φ = 145220848.

The previous prime is 145220807. The next prime is 145220879. The reversal of 145220849 is 948022541.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 76247824 + 68973025 = 8732^2 + 8305^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-145220849 is a prime.

It is not a weakly prime, because it can be changed into another prime (145220879) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72610424 + 72610425.

It is an arithmetic number, because the mean of its divisors is an integer number (72610425).

Almost surely, 2^145220849 is an apocalyptic number.

It is an amenable number.

145220849 is a deficient number, since it is larger than the sum of its proper divisors (1).

145220849 is an equidigital number, since it uses as much as digits as its factorization.

145220849 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23040, while the sum is 35.

The square root of 145220849 is about 12050.7613452429. The cubic root of 145220849 is about 525.6253760007.

The spelling of 145220849 in words is "one hundred forty-five million, two hundred twenty thousand, eight hundred forty-nine".