145720349 has 2 divisors, whose sum is σ = 145720350. Its totient is φ = 145720348.

The previous prime is 145720321. The next prime is 145720357. The reversal of 145720349 is 943027541.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 109202500 + 36517849 = 10450^2 + 6043^2 .

It is an emirp because it is prime and its reverse (943027541) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-145720349 is a prime.

It is a super-2 number, since 2×145720349² = 42468840225363602, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (145720369) 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, 72860174 + 72860175.

It is an arithmetic number, because the mean of its divisors is an integer number (72860175).

Almost surely, 2^145720349 is an apocalyptic number.

It is an amenable number.

145720349 is a deficient number, since it is larger than the sum of its proper divisors (1).

145720349 is an equidigital number, since it uses as much as digits as its factorization.

145720349 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 30240, while the sum is 35.

The square root of 145720349 is about 12071.4683862403. The cubic root of 145720349 is about 526.2273314128.

The spelling of 145720349 in words is "one hundred forty-five million, seven hundred twenty thousand, three hundred forty-nine".