145981637 has 2 divisors, whose sum is σ = 145981638. Its totient is φ = 145981636.

The previous prime is 145981631. The next prime is 145981673. The reversal of 145981637 is 736189541.

Together with next prime (145981673) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 75186241 + 70795396 = 8671^2 + 8414^2 .

It is a cyclic number.

It is not a de Polignac number, because 145981637 - 2¹⁰ = 145980613 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (145981631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72990818 + 72990819.

It is an arithmetic number, because the mean of its divisors is an integer number (72990819).

Almost surely, 2^145981637 is an apocalyptic number.

It is an amenable number.

145981637 is a deficient number, since it is larger than the sum of its proper divisors (1).

145981637 is an equidigital number, since it uses as much as digits as its factorization.

145981637 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 181440, while the sum is 44.

The square root of 145981637 is about 12082.2860833536. The cubic root of 145981637 is about 526.5416658870.

The spelling of 145981637 in words is "one hundred forty-five million, nine hundred eighty-one thousand, six hundred thirty-seven".