145661249 has 2 divisors, whose sum is σ = 145661250. Its totient is φ = 145661248.

The previous prime is 145661237. The next prime is 145661251. The reversal of 145661249 is 942166541.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 87291649 + 58369600 = 9343^2 + 7640^2 .

It is a cyclic number.

It is not a de Polignac number, because 145661249 - 2¹⁶ = 145595713 is a prime.

Together with 145661251, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (145661279) 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, 72830624 + 72830625.

It is an arithmetic number, because the mean of its divisors is an integer number (72830625).

Almost surely, 2^145661249 is an apocalyptic number.

It is an amenable number.

145661249 is a deficient number, since it is larger than the sum of its proper divisors (1).

145661249 is an equidigital number, since it uses as much as digits as its factorization.

145661249 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 51840, while the sum is 38.

The square root of 145661249 is about 12069.0202170682. The cubic root of 145661249 is about 526.1561808817.

The spelling of 145661249 in words is "one hundred forty-five million, six hundred sixty-one thousand, two hundred forty-nine".