145501621 has 2 divisors, whose sum is σ = 145501622. Its totient is φ = 145501620.

The previous prime is 145501597. The next prime is 145501627. The reversal of 145501621 is 126105541.

It is a happy number.

145501621 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., 115799121 + 29702500 = 10761^2 + 5450^2 .

It is a cyclic number.

It is not a de Polignac number, because 145501621 - 2¹⁵ = 145468853 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (145501627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72750810 + 72750811.

It is an arithmetic number, because the mean of its divisors is an integer number (72750811).

Almost surely, 2^145501621 is an apocalyptic number.

It is an amenable number.

145501621 is a deficient number, since it is larger than the sum of its proper divisors (1).

145501621 is an equidigital number, since it uses as much as digits as its factorization.

145501621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1200, while the sum is 25.

The square root of 145501621 is about 12062.4052742395. The cubic root of 145501621 is about 525.9639083796.

The spelling of 145501621 in words is "one hundred forty-five million, five hundred one thousand, six hundred twenty-one".