145451689 has 2 divisors, whose sum is σ = 145451690. Its totient is φ = 145451688.

The previous prime is 145451639. The next prime is 145451737. The reversal of 145451689 is 986154541.

145451689 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 can be written as a sum of positive squares in only one way, i.e., 145082025 + 369664 = 12045^2 + 608^2 .

It is a cyclic number.

It is not a de Polignac number, because 145451689 - 2¹⁵ = 145418921 is a prime.

It is not a weakly prime, because it can be changed into another prime (145451639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72725844 + 72725845.

It is an arithmetic number, because the mean of its divisors is an integer number (72725845).

Almost surely, 2^145451689 is an apocalyptic number.

It is an amenable number.

145451689 is a deficient number, since it is larger than the sum of its proper divisors (1).

145451689 is an equidigital number, since it uses as much as digits as its factorization.

145451689 is an evil number, because the sum of its binary digits is even.

The product of its digits is 172800, while the sum is 43.

The square root of 145451689 is about 12060.3353601797. The cubic root of 145451689 is about 525.9037362330.

The spelling of 145451689 in words is "one hundred forty-five million, four hundred fifty-one thousand, six hundred eighty-nine".