145372309 has 2 divisors, whose sum is σ = 145372310. Its totient is φ = 145372308.

The previous prime is 145372303. The next prime is 145372327. The reversal of 145372309 is 903273541.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 145323025 + 49284 = 12055^2 + 222^2 .

It is a cyclic number.

It is not a de Polignac number, because 145372309 - 2³ = 145372301 is a prime.

It is a super-2 number, since 2×145372309² = 42266216447982962, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (145372301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72686154 + 72686155.

It is an arithmetic number, because the mean of its divisors is an integer number (72686155).

Almost surely, 2^145372309 is an apocalyptic number.

It is an amenable number.

145372309 is a deficient number, since it is larger than the sum of its proper divisors (1).

145372309 is an equidigital number, since it uses as much as digits as its factorization.

145372309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 22680, while the sum is 34.

The square root of 145372309 is about 12057.0439577867. The cubic root of 145372309 is about 525.8080484816.

The spelling of 145372309 in words is "one hundred forty-five million, three hundred seventy-two thousand, three hundred nine".