145447949 has 2 divisors, whose sum is σ = 145447950. Its totient is φ = 145447948.

The previous prime is 145447919. The next prime is 145447957. The reversal of 145447949 is 949744541.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 95844100 + 49603849 = 9790^2 + 7043^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-145447949 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (145447909) 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, 72723974 + 72723975.

It is an arithmetic number, because the mean of its divisors is an integer number (72723975).

Almost surely, 2^145447949 is an apocalyptic number.

It is an amenable number.

145447949 is a deficient number, since it is larger than the sum of its proper divisors (1).

145447949 is an equidigital number, since it uses as much as digits as its factorization.

145447949 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 725760, while the sum is 47.

The square root of 145447949 is about 12060.1803054515. The cubic root of 145447949 is about 525.8992286726.

The spelling of 145447949 in words is "one hundred forty-five million, four hundred forty-seven thousand, nine hundred forty-nine".