145531894447 has 2 divisors, whose sum is σ = 145531894448. Its totient is φ = 145531894446.

The previous prime is 145531894331. The next prime is 145531894451. The reversal of 145531894447 is 744498135541.

It is a happy number.

145531894447 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 145531894447 - 2¹⁵ = 145531861679 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (145531892447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72765947223 + 72765947224.

It is an arithmetic number, because the mean of its divisors is an integer number (72765947224).

Almost surely, 2^145531894447 is an apocalyptic number.

145531894447 is a deficient number, since it is larger than the sum of its proper divisors (1).

145531894447 is an equidigital number, since it uses as much as digits as its factorization.

145531894447 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9676800, while the sum is 55.

The spelling of 145531894447 in words is "one hundred forty-five billion, five hundred thirty-one million, eight hundred ninety-four thousand, four hundred forty-seven".